Chapter Summaries

Gavin faced Cordelia’s anger after she found him in the Chamber of Secrets, then explained that Lockhart and Voldemort were involved. When Snape accused Gavin of killing Lockhart, Gavin produced another, living Lockhart as proof, and Professor McGonagall decided to contact Dumbledore by a drastic method.

• Cordelia confronted Gavin about disappearing, punched him, and then tearfully hugged him after he apologized.
• Professor McGonagall, Snape, Hermione, and Justin arrived and found Gavin with Cordelia; Hermione and Justin left when McGonagall sent them back to their common rooms.
• Gavin told the professors that Lockhart had opened the Chamber and been killed by its monster, while Snape accused Gavin of being the Heir of Slytherin and demanded to see his memories.
• Gavin refused to show Snape his memories and produced a second, unconscious Lockhart from his pouch as evidence.
• Professor McGonagall confirmed that the second Lockhart was alive and said she would use a drastic method to contact Dumbledore.

Gavin and Cedric tested and ate dragon steak, with Cedric paying for his share in an unfertilized Occamy Egg. The next morning, Justin teased Ernie about Lockhart’s suspended classes, and Gavin went to meet Dumbledore in the wrecked Headmaster’s Office, where he learned Professor McGonagall had blasted her way in to reach him.

• Cedric ate Gavin’s dragon steak before learning it came from a Hebridean Black Dragon, then waited ten minutes to see if he showed signs of poisoning.
• Gavin ate the dragon meat and found that it restored some of his magic and strength, while Cedric bought more steak on credit and settled the twenty-Galleon bill with an unfertilized Occamy Egg.
• Ernie questioned Justin about Lockhart’s suspended classes, and Justin’s evasive answers led Ernie to conclude that Justin was Lockhart’s illegitimate son.
• Professor McGonagall’s Patronus summoned Gavin to the Headmaster’s Office.
• Gavin found Dumbledore in the badly damaged office and learned that Professor McGonagall had blasted open the door while trying to reach him.
• Gavin told Dumbledore he might use the same forceful method the next time he could not find him.

Gavin told Dumbledore how he had uncovered the Diary and defeated Tom in the Chamber of Secrets, then questioned him about Horcruxes, souls, and death. Dumbledore revealed that the fake Lockhart’s body had disappeared, leaving his identity and fate unresolved.

• Dumbledore gave Gavin a phoenix feather for contacting him and explained that he had been in France settling Nicolas and Perenelle Flamel’s affairs.
• Gavin recounted how the Diary had reached Ginny Weasley, how he exposed the fake Lockhart, and how he burned Tom’s soul fragment in the Chamber of Secrets.
• Gavin and Dumbledore watched Gavin’s extracted memory in the Pensieve, and Dumbledore grew concerned about Gavin’s use of the Obscurus.
• Dumbledore explained what he knew about Horcruxes, while Gavin discussed his views on long life, death, and the possibility of an afterlife.
• Dumbledore refused to let Gavin read books about Horcruxes but described their known effects and limitations.
• Dumbledore apologized and told Gavin that the fake Lockhart’s body was gone.

Gavin and Dumbledore investigated Fake Lockhart’s vanished corpse and discussed how dangerous enemies might survive, while Gavin resolved to leave no loose ends next time. At breakfast, the school heard that Lockhart was merely recovering, and Cordelia confronted Gavin about lying and risking his safety.

• Dumbledore told Gavin that Fake Lockhart’s corpse had disappeared and that its footprints led to the edge of the Forbidden Forest before vanishing beside a lake.
• Gavin shared his theories about Fake Lockhart’s escape, learned Dumbledore had suspected the real Lockhart of stealing memories, and urged Hogwarts to improve its security.
• Gavin wondered whether forces of balance were shaping events and told Dumbledore he should destroy enemies’ corpses to prevent their return.
• Gavin reassured students that Lockhart was only in shock, and Professor McGonagall announced that Defense Against the Dark Arts classes would resume in a week.
• Cordelia challenged Gavin about misleading the students and asked him to promise he would seek help when in danger; she confiscated his pumpkin juice after he said he would try.

Professor McGonagall explained the four-stage Animagus ritual to Gavin, who began wondering how to guarantee the required clear sky and thunderstorm. In the Room of Requirement, Gavin reviewed his investigations and chose to focus next on experimenting with the Water of Alaya Consciousness.

• Professor McGonagall told Gavin that becoming an Animagus required keeping a Mandrake leaf in his mouth for a month, preparing a potion under a clear full moon, protecting it in darkness, and waiting for a thunderstorm while reciting an incantation.
• Gavin considered ways to clear the sky, and Professor McGonagall warned him not to attempt Weather Magic by himself.
• Gavin reviewed his research list in the Room of Requirement and set aside investigations into Fake Lockhart, the Flame Crest, weather control, and Parseltongue for later.
• Gavin marked using the Obscurus without consuming life force as urgent, but requiring more preliminary research.
• Gavin entered his Consciousness Space and contemplated pouring the Water of Alaya Consciousness over himself.

Gavin used Water of Alaya Consciousness on one eye and endured a torrent of other beings’ sensory experiences that left him overwhelmed by emptiness and doubt. After his friends noticed his changed behavior, Cordelia learned why he had risked it and comforted him, and Gavin began to recover.

• Gavin used the Levitation Charm in his Consciousness Space to lift River water and touched a drop to his right eye.
• Gavin experienced a flood of perceptions from animals and plants, then collapsed in the Room of Requirement with a profound sense of meaninglessness.
• Gavin ignored food and lessons, alarming Justin, Ernie, Professor Flitwick, and his other classmates.
• Hermione asked Professor Flitwick about Gavin’s private lessons and learned how much advanced magic he had studied and developed.
• Cordelia confronted Gavin, learned he had used the water because he feared being helpless against another Fake Lockhart, and hugged him until he felt more present.
• Gavin joked that Hogwarts should prescribe hugs, and Cordelia recognized that he had improved and walked away.

Gavin tested a way to clear clouds for his Animagus preparations and triggered a hailstorm over Hogwarts. The moonlight reached the Black Lake, but the exhausted students and Professor McGonagall’s reaction suggested the experiment had come at a cost.

• Gavin returned to normal after Cordelia’s treatment, then advised Justin to stare at a wall before studying.
• Lockhart returned to Hogwarts, while Ernie prepared questions based on lessons from the impostor who had replaced him.
• Gavin watered his right eye again and used the memory of an embrace as an anchor against the flood of visions.
• Gavin tested a Freezing Charm high above the Forbidden Forest, creating a cold downdraft that cleared the clouds and produced a hailstorm.
• The hail kept Hogwarts students awake, and Gavin told Justin and Ernie that the weather was complicated while Professor McGonagall watched him.

Gavin took Justin fishing to cheer him up after his breakup with Susan, but failed to catch anything until Cordelia tried the rod and landed a huge trout. As they ate the grilled fish, Cordelia planned a lavish birthday present for Justin, and Gavin warned that her thousand-Galleon budget sounded more like a death benefit.

• Gavin checked Justin for Dark Magic before Ernie explained that Justin and Susan had broken up because Justin could not tell which of his feelings had been real.
• Gavin took Justin and Ernie fishing at the Black Lake, where he caught nothing with his lures while Ernie filled his bucket.
• Cordelia, Tracy, and Daphne joined them, and Gavin knocked out more than a dozen fish by striking the lake with a magically enlarged club.
• Cordelia tried Gavin’s fishing rod and hooked a huge trout, which the group landed and Gavin cooked over a campfire.
• Cordelia told Gavin she wanted to buy Justin a birthday present worth up to a thousand Galleons, and Gavin called it a death benefit.

Lockhart returned to teaching, but his first lesson back was a quiz about himself, while Gavin avoided his invitation to discuss the Chamber of Secrets. At Justin’s birthday party, Cordelia gave Justin a costly protective amulet and later gave Gavin dragon-hide bracers; the chapter ended with Gavin considering how to use the Obscurus without limit.

• Lockhart gave the Hufflepuff and Slytherin students a quiz about his favorite things instead of teaching Defense Against the Dark Arts.
• Lockhart thanked Gavin for rescuing him and invited him to discuss their battle, but Gavin declined and left with Cordelia.
• Hermione questioned Lockhart’s changed teaching style while Ron and Harry described his essay assignment at Justin’s birthday party.
• Justin received gifts from his friends, including a costly protective amulet from Cordelia, which Gavin persuaded him to accept.
• Cordelia gave Gavin dragon-hide bracers worth five hundred Galleons, explaining that they could protect him from spells.
• At midnight, Gavin studied the question of how to use the Obscurus without limit on the Room of Requirement’s blackboard.

Gavin investigated how to reduce the life force consumed by the Obscurus, finding that tonics only offered a limited reserve and considering Horcruxes, the Elixir of Life, and magic as possible answers. A letter from Mr. Rowle then linked Elias Salos to Cyril Rosier and a vanished orphanage, leaving Gavin suspicious that the Obscurus mystery involved something darker.

• Gavin tested tonics and concluded they reduced the Obscurus's drain on his own life force but could not restore what he had lost.
• Gavin considered studying Horcruxes and the Elixir of Life, then analyzed wizarding lifespans and wondered whether magic replenished life force.
• Gavin asked Ernie about stronger tonics, and Ernie said his grandfather had failed to reproduce the Elixir of Life without the Philosopher's Stone.
• Gavin told Cordelia he was keeping a Mandrake leaf in his mouth to learn to become an unregistered Animagus, and she agreed to keep it secret.
• Mr. Rowle wrote that Elias Salos had disappeared after being seen with Cyril Rosier, who had operated an orphanage for Muggle children with magical talent before vanishing himself.
• Gavin connected Rosier to Vinda Rosier and grew wary of the orphanage as he considered whether the discovery related to the Obscurus.

After Snape gave Gavin one Galleon for inspiring his improved anti-Polyjuice potion, Dumbledore gifted him a ring containing some of the Philosopher’s Stone’s magic. Gavin revealed that he had found what might be Ravenclaw’s Diadem in the Room of Requirement and proposed delaying its destruction so they could learn more about Tom’s Horcruxes, ending with his plan to “pull a Tang Yin on him.”

• Dumbledore announced that Snape’s improved potion reversing Polyjuice transformations had been purchased by the Ministry, and Snape privately gave Gavin one Galleon as his share of the reward.
• Gavin told Snape about a supposedly legendary annotated copy of Advanced Potion-Making, prompting Snape to leave and direct him to Dumbledore’s office.
• Dumbledore gave Gavin a ring containing enough of the Philosopher’s Stone’s magic for several uses, explaining that Nicolas had made it for him before his death.
• Gavin asked whether the Stone’s magic could destroy a Horcrux, then told Dumbledore he had found a crown resembling Ravenclaw’s Diadem in the Room of Requirement.
• Dumbledore wanted to deal with the suspected Horcrux immediately, but Gavin argued that they should gather information first and investigate whether Tom had made more Horcruxes.
• After learning that Dumbledore had the Sword of Gryffindor, Gavin said he intended to pull a Tang Yin on Tom.

Tom Riddle awakened inside Ravenclaw's Diadem and tried to learn what had happened to Voldemort, but Gavin and Dumbledore trapped him in Dumbledore's Consciousness Space. Dumbledore extracted the secret of the Horcruxes, and Gavin used the Obscurus to destroy the soul fragment, leaving the Diadem cleansed.

• Tom Riddle awakened when Draco Malfoy put on the Diadem, and Draco told him that Voldemort had fallen and that Dumbledore was searching for the last Horcrux.
• Tom questioned Draco about Voldemort's soul and became suspicious when Draco compared the Horcrux plan to a Quintaped.
• Tom cast Legilimency and entered Gavin's Consciousness Space, where Gavin revealed that he had lured Tom into a trap with Dumbledore.
• Dumbledore appeared in the Consciousness Space and subdued Tom with Legilimency while Gavin prepared the Obscurus.
• Gavin touched Tom's soul fragment with the Obscurus, destroying it, and Dumbledore removed the cleansed Diadem.

Gavin reviewed what he had learned from Tom’s soul fragment, then disabled the bewitched Bludger before watching Cordelia face Harry in the first Quidditch match of the season. Cordelia caught the Golden Snitch and Slytherin won, while Harry narrowly avoided injury; the result sparked a feud that lasted for weeks, and the next match revealed that Gryffindor and Ravenclaw had more to worry about.

• Gavin concluded that the Philosopher’s Stone could extract a soul from a Horcrux, and he hoped to use that power on Hufflepuff’s Cup.
• Gavin used Finite Incantatem to stop the Bludger from targeting Harry before the match began.
• Cordelia and Harry raced for the Golden Snitch, and Cordelia caught it after Gavin’s training helped her anticipate its movements.
• Cordelia softened the ground with a Transfiguration Spell as Harry fell, saving him from serious injury; Slytherin won 180 to 10 in five minutes and seven seconds.
• Gryffindor and Slytherin students argued over the unusually short match, and their feud led to weeks of fights and detentions.
• At the start of the second Quidditch match, Gryffindor and Ravenclaw discovered that their situation was worse than they had thought.

Cho Chang used a mathematical model to catch the Golden Snitch and win Ravenclaw’s match against Hufflepuff in just over ten minutes, prompting Professor McGonagall to summon every Seeker and Gavin. Gavin, unaware of the summons, experimented with Muffliato in the Room of Requirement before heading to McGonagall’s office after hearing she wanted him.

• Cedric and Cho both flew Nimbus 2000s, but Cho caught the Golden Snitch in ten minutes and forty-two seconds, giving Ravenclaw a 160–30 win over Hufflepuff.
• Cedric’s teammates realized Cho had predicted the Snitch’s turn, and Cedric admitted he had once mentioned using a Probability Model to her.
• Professor McGonagall questioned Harry, Cordelia, Cedric, and Cho, learning that Gavin had taught Cordelia and Cedric the method and that Cho had developed a model with help from her grandfather.
• Professor McGonagall sent a silver cat to summon Gavin, while Gavin experimented with using Muffliato to reproduce Parseltongue and music and considered its potential for resonance.
• Gavin went to the Great Hall, where Justin and Ernie told him that Professor McGonagall had been waiting for him, and he left with a meat bun to go to her office.

Gavin agreed to help revise Hogwarts Quidditch rules after Cordelia asked him, and Professor McGonagall posted temporary changes that added three Snitches, a match time limit, and a uniform broom budget. The rules sparked a confrontation with Slytherin and Snape, and as Hufflepuff prepared for Saturday’s trial match, Gavin revealed he had contracted not to advise either team as referee.

• Professor McGonagall showed Gavin how short the recent Quidditch matches had been and asked him to help fix the rules, but he initially refused because any changes would anger the Houses.
• Cordelia told Gavin she wanted a fair chance to race Harry, so he agreed to help after she called him “big brother.”
• Professor McGonagall and Madam Hooch posted temporary rules adding a dinner-bell cutoff, three Snitches, and a shared broom budget, prompting Marcus Flint to challenge Gavin.
• Snape objected to the broom budget, but Gavin warned that he would teach Harry his Snitch-catching method, and Snape accepted the temporary rules to avoid Harry becoming a Quidditch star.
• Professor McGonagall announced a Saturday trial match between Slytherin and Hufflepuff, and Gavin revealed to Cedric that his contract as referee barred him from advising either team.

Gavin completed the final step of his Animagus Transformation during a thunderstorm and discovered that he could turn into a seagull. After a frightening first flight and trouble changing back, he returned to human form with Cordelia’s help, and the two ended the night together in the Astronomy Tower.

• Gavin brought Cordelia to the Astronomy Tower and drank the potion to complete his Animagus Transformation without waiting for Professor McGonagall’s approval.
• Gavin endured the transformation and became a seagull, then flew over the Black Lake while struggling to control his animal instincts.
• Gavin returned to the tower after seeing Cordelia searching for him with a light, but he could not speak or change back at first.
• Cordelia promised to stay with Gavin until he changed back, and he regained his human form by focusing on his original heartbeat.
• Gavin dried Cordelia’s clothes, asked her not to tell Professor McGonagall yet, and then transformed into a seagull again so she could inspect him.

After becoming an Animagus, Gavin discovered that seagull-like senses and instincts had transformed his flying and appetite. He refereed a trial Quidditch match under new rules, which Slytherin won, and Professor McGonagall summoned him afterward.

• Gavin sensed Snape approaching through changes in the air, then found himself craving fish and chips after smelling Cedric's lunch.
• Gavin opened the friendly Slytherin–Hufflepuff match with rock music and used his enhanced perception to make strict calls, dodge a Bludger, and rescue a falling Hufflepuff Chaser.
• Cedric played as Hufflepuff's extra Chaser while Cordelia tracked the Snitches; Cordelia caught the Silver Snitch, and Cedric caught the Bronze Snitch.
• Cordelia caught the Golden Snitch after a dangerous race with Cedric, giving Slytherin a 230–210 victory under the new rules.
• Hufflepuffs praised Gavin's flying and invited him to join their team, but he declined before Professor McGonagall called him away to speak privately.

Professor McGonagall realized Gavin had become an Animagus but let him keep his transformation secret while warning him about its dangers. In the Great Hall, students debated the new Quidditch rules, and Cedric grew wary when Cho threatened to ask Gavin about predicting the Golden Snitches.

• Professor McGonagall questioned Gavin about his flying, concluded he had become an Animagus, and chose not to report him to the Ministry.
• Gavin asked Professor McGonagall about animal instincts, bodily functions, death, and magic in animal form, then said he would have chosen a seagull form.
• Gavin joined students in the Great Hall as they argued over the new Quidditch rules, while Fred and George sold themed merchandise and candies.
• Cordelia, Harry, and Cho Chang began practicing Chaser techniques, and Cho regularly asked Cedric to teach her.
• Cedric recalled Cho's earlier question about predicting the Snitches' paths and urged her to ask him instead of Gavin.

Gavin learned that Cyril Rosier had killed all sixty-four children at an Austrian orphanage during experiments and resolved to grow stronger while helping protect Cordelia. He agreed to spend Christmas at Rowle Manor, but Professor Roscoe’s urgent letter revealed that Gavin’s parents had discovered his activities, forcing him to go home instead.

• Dumbledore announced that Mr. Rowle had donated the Thief's Downfall, and students turned it into a crowded wishing fountain.
• Gavin received Mr. Rowle’s report that Cyril Rosier had killed sixty-four orphanage children in experiments, prompting Mr. Rowle to launch an investigation and hunt for Cyril.
• Gavin decided to accelerate his research and agreed to stay at Rowle Manor for Christmas to protect Cordelia during the journey home.
• Nyx delivered Professor Roscoe’s letter warning Gavin that his parents had discovered what he had been doing, so Gavin told Cordelia he had to go home.

Gavin returned home after Professor Roscoe apologized to his parents for covering up his absence from Oxford, and he finally told them he had been attending Hogwarts. The family waited for a Hogwarts teacher to explain, and Dumbledore arrived just as Roscoe realized the visitor looked like Gandalf.

• Professor Roscoe explained that Gavin’s parents had discovered he had not been attending Oxford and apologized with an assortment of gifts.
• Gu Jianguo questioned Gavin about his whereabouts, and Gavin admitted he was not at Oxford and had earned an Oxford doctorate in a day.
• Gavin told Gu Jianguo and Lin Wanyin that he attended Hogwarts School of Witchcraft and Wizardry, but they feared he had been deceived or threatened.
• Gavin said a teacher would arrive at six, and the doorbell rang as the clock struck the hour.
• Dumbledore arrived carrying a jar of Coca-Cola syrup, greeted Gavin, and entered the house while Roscoe recognized him as Gandalf.