Chapter Summaries

Gavin learned that the Philosopher’s Stone still existed and negotiated with Dumbledore for limited Time-Turner use while agreeing to help the Longbottom Family. After encountering Cordelia following her broom collision with Draco, he agreed to take her to Azkaban after class, then discovered Rolf’s school beauty ranking in Charms.

• Dumbledore told Gavin that the Philosopher’s Stone had been preserved because Nicolas Flamel changed his will after learning Cordelia had been freed from the Obscurus, and said its true ownership remained undisclosed until the proper time.
• Gavin told Dumbledore he would research a new way to treat the Longbottom Family and secured permission to keep all his courses and use a Time-Turner for no more than one hour at a time with Dumbledore present.
• Gavin found Cordelia and Draco in the corridor after Cordelia beat him in a broom contest and Draco crashed into a wooden railing; Cordelia then reassured her anxious father through a Two-Way Mirror.
• Cordelia gave Gavin the lunch she had saved for him, and he agreed they could use a Portkey to visit Erebus in Azkaban after class.
• In Charms, Gavin saw Rolf’s school beauty ranking, where Rolf crossed out several names after learning the girls had boyfriends or admirers, and Gavin wondered how Rolf would react when he met Luna.

Gavin asked Professor Flitwick how the Levitation Charm could affect unseen objects, then took Cordelia to the Room of Requirement, where her request unexpectedly created a doorway to Azkaban. After confronting Theodore Nott and checking on Erebus, Gavin planned to ask Mr. Rowle to care for the recovering dragon.

• Gavin demonstrated precise control of a water-filled glass, and Professor Flitwick explained that mastery of the Levitation Charm could let a wizard sense and move unseen objects.
• Gavin led Cordelia to the Room of Requirement and showed her his private workspace and spell research.
• When Cordelia wished for an easier way to enter the room, a stone door appeared and transformed Gavin's unfinished Portkey into a passage to Azkaban.
• Theodore Nott begged Gavin for protection, but Gavin revealed that he had given Rita Skeeter the material that led to Theodore and his father being imprisoned; he ordered that Theodore live until his sentence ended.
• Cordelia showed Gavin that Erebus had recovered but needed more space, so Gavin decided to ask Mr. Rowle to look after the dragon.

Gavin returns the Marauder’s Map to Fred and George with two hundred Galleons in interest, then attends Care of Magical Creatures, where Buckbeak submits to him after sensing the restrained Obscurus. The lesson ends with Hagrid discovering that the terrified Hippogriff has wet himself.

• Gavin returns the Marauder’s Map to George and gives the twins two hundred Galleons as interest; Fred and George accept after recording the amount in their notebook.
• Gavin joins Justin, Rolf, and Ernie on the way to Care of Magical Creatures, where they discuss Cordelia’s encounter with a Hippogriff and Rolf’s grandfather.
• Rolf calms a Monster Book of Monsters for a Ravenclaw girl, then follows Hagrid’s instructions to bow to Buckbeak and takes a successful flight.
• Gavin forgets to bow while studying Buckbeak as food, but the Hippogriff freezes, collapses in submission, and lets Gavin ride him around the grounds.
• Buckbeak carries Gavin on a slow, careful flight and kneels to let him dismount; Hagrid then notices the Hippogriff has wet himself.

Gavin’s calm handling of Buckbeak and the arrival of Harry’s Firebolt stirred excitement and concern over Hogwarts’ Quidditch budget. As Ravenclaw sought Hufflepuff’s support to raise the limit, Gavin told Cedric he could still secure Hufflepuff a victory if the restriction on his involvement was lifted.

• Hufflepuff students debated Buckbeak’s fear of Gavin, while Cordelia revealed that Gavin had once told a Dementor to leave him alone.
• Harry received an unmarked Firebolt, but Professor McGonagall confiscated it for a safety inspection and questioned the twins’ attempt to list its value as zero.
• Gavin learned that Ravenclaw had won the previous year’s Quidditch Cup by ten points and that Hufflepuff had finished fourth.
• Cedric told Gavin that Cho had asked Hufflepuff to support a petition to raise the Quidditch broom budget.
• Gavin advised Cedric to request that the restriction preventing him from advising the teams be lifted after the petition was submitted, and promised he could still win for Hufflepuff.

Gavin’s Defense Against the Dark Arts class with Lupin turned into a boggart lesson, where the creature could not settle on a fear while Gavin faced it. After class, Gavin reassured Cordelia with a romantic confession, then returned to ask Lupin whether a werewolf could eat chocolate while transformed.

• Ron, Harry, and Hermione told Gavin and Rolf about Snape’s cruel Potions lesson, while Rolf learned that Snape had given Gavin an Outstanding grade.
• Lupin taught the students to fight a boggart with the Riddikulus spell, and Neville transformed the boggart-Snape into his grandmother’s clothes.
• Rolf made the boggart reveal his fear of baldness, while Ron turned its giant spider form into a roller-skating spectacle.
• The boggart repeatedly failed to take shape in Gavin’s presence, so Lupin ended his turn and said he would investigate the unusual effect.
• Cordelia waited for Gavin after class, and Gavin’s declaration that he loved the sun, the moon, and her left her blushing and flustered.
• Gavin returned to the Staff Room alone and asked Lupin whether a werewolf could eat chocolate while transformed.

Gavin uncovered Lupin’s werewolf secret, offered to help him investigate a cure, and earned permission to consult Dumbledore about observing a transformation. In the Room of Requirement, Gavin added Coca-Cola and Nitroglycerin to Hufflepuff’s Cup, found the explosive too dangerous to use, and began a new project called “Eternal Blazing Sun.”

• Gavin revealed that he had deduced Lupin was a werewolf, and Lupin admitted it after Gavin promised to keep the secret.
• Gavin asked to observe Lupin’s next transformation and showed him the Armenian wizard’s research into a spell that could restore a transformed werewolf to human form.
• Lupin agreed to consult Dumbledore before allowing Gavin to watch the transformation and kept Gavin’s copies of the research manuscript.
• Gavin recorded Mexican Coca-Cola in Hufflepuff’s Cup and successfully reproduced its taste and chill.
• Gavin made Nitroglycerin, recorded it in the Cup, and tested its destructive force on a training dummy before deciding its instability made it unsuitable.
• Gavin reasoned that the Cup might produce Heavy Water and created a new project in the Book of Ten Thousand Spirits Calculation, naming it “Eternal Blazing Sun.”

Gavin used the Book of Ten Thousand Spirits Calculation to begin designing a magical fusion configuration, then joined his roommates for fishing at the Black Lake. Rolf outcaught Gavin but felt left out until he met Luna Lovegood and was immediately captivated by her.

• Gavin rejected the Calculation Book’s assumption that he wanted to destroy the world and ordered it to model light-nucleus fusion, naming his proposed design the Gu Wen Configuration.
• Rolf told Justin and Ernie that Gemma Farley and Padma Patil had rejected him, then learned Parvati’s pink letter was intended for Gavin.
• Justin persuaded Gavin to go fishing with Rolf, and Rolf caught several fish while Gavin’s bucket stayed empty.
• Cordelia joined the group with Tracy Davis, Daphne Greengrass, and Astoria, while Ernie tried to impress Daphne by explaining how to bait a hook.
• Feeling overlooked despite catching many fish, Rolf wandered away, tripped into a Gnome hole, and met Luna Lovegood, who asked whether Wrackspurts had made him fall.
• Justin identified Luna as a Ravenclaw whom others called Loony, and Rolf watched her beneath a beech tree and murmured that she was beautiful.

Rolf added Luna Lovegood to the top of his list and tried to plan how to meet her, but his first Potions class with Snape soon took over his attention. When Snape nearly gave Rolf a failing mark, Gavin intervened with a familiar gesture, and Rolf left convinced his grandfather had been right to trust Gavin.

• Rolf revised his list of girls and placed Luna Lovegood first after admitting he could not stop thinking about her.
• Rolf and Ernie tried to work out Luna's routines, while Ernie reminded Rolf that he had promised to sit in the front row for Potions.
• Rolf persuaded Gavin to sit beside him in the front row, and Snape singled him out to demonstrate the Shrinking Solution.
• Rolf struggled under Snape's scrutiny, but he correctly prepared the ingredients and Snape finished the potion after Rolf lost track of the drops.
• As Snape prepared to mark Rolf's work and penalize Hufflepuff, Gavin made a fan-like gesture that stopped him from writing.
• Snape left the assessment book blank and ordered Rolf to bottle his potion, while Rolf quietly moved closer to Gavin and thought his grandfather had been right.

Gavin collected his share of the basilisk remains from Snape, then joined Dumbledore to test a Ministry-approved Time-Turner. The device exploded and knocked Gavin unconscious; he awoke inside an unfamiliar consciousness landscape and met a frightened boy who looked exactly like him and called himself Gavin Gu.

• Snape handed Gavin basilisk materials, including a sealed Snake Eye, snakeskin, Snake Horn, venom, and the remaining snake meat, then told him Dumbledore was waiting.
• Dumbledore reviewed the Time-Turner’s rules with Gavin and took him to the Astronomy Tower for a supervised one-hour test.
• Gavin turned the Time-Turner once, but it failed to flip before shuddering and exploding in a burst of white light.
• Dumbledore caught the unconscious Gavin, checked him with the Elder Wand, and sent a phoenix to summon Poppy.
• Gavin regained awareness in the River of Alaya Consciousness, found the Obscurus vortex gone, and saw a frightened boy who looked like him.
• The boy slowly raised his face and told Gavin, “My name is... Gavin Gu.”

Gavin encountered the frightened original consciousness of his body, learned about the boy’s abuse at Hogwarts, and agreed to take control and fight back. After confronting Goyle and the other Slytherins, Gavin realized he was trapped in a twisted version of the wizarding world and wanted to return home.

• Gavin met the body’s original consciousness in the inner void and learned that Muggle-born Slytherin student had been bullied by Goyle, Crabbe, and others.
• The boy revealed that he had entered the inner landscape through meditation since age nine, but fear and abuse had kept him from defending himself.
• Gavin promised to take over, then woke in the corridor and frightened Goyle into backing down after insulting and threatening him.
• Snape dismissed the confrontation, while Gavin noticed the watching Slytherin Daiya and received a handkerchief from Ron.
• Gavin met Harley Potter and learned that Hermione was close to Draco Malfoy, then realized this world’s relationships and identities differed sharply from the ones he knew.
• With no way to contact his original world, Gavin followed Ron and Harley toward the Great Hall while wishing he could go home.

Gavin learned that Draco was pushing himself to prepare for Bellatrix Lestrange, who had escaped Azkaban and threatened his life, while Hermione’s efforts to help him ended in rejection. After Gavin’s original body regained control during a dormitory attack and defeated three bullies, he rushed to bring food to someone hiding on the Seventh Floor, where he found Cordelia.

• At dinner, Draco refused Hermione’s food and concern, called her a “Mudblood,” and told her to stay away from him; Ron explained that Lucius had died in Azkaban and that Hermione and Draco had bonded after Draco took a troll’s blow for her.
• Ron and Harley told Gavin that Bellatrix Lestrange had escaped Azkaban and threatened Draco, while Neville Longbottom was the Boy Who Lived and feared Dementors.
• Gavin’s original self woke as Goyle, Crabbe, and Theodore Nott tried to attack him in the Slytherin dormitory, and Gavin used spells to defeat all three.
• Goyle and Crabbe promised not to report Gavin, so he left the dormitory and headed for the Seventh Floor with the original Gavin’s memories guiding him.
• Gavin visited the kitchens for warm Pumpkin Juice and cream pudding, then entered a hidden room on the Seventh Floor and found a girl who the other Gavin recognized as Cordelia.

Gavin met the sick, silver-blond girl for their weekly meal, then told Gavin Gu how they had become friends and revealed his struggles with magic and life at Hogwarts. Gavin Gu recognized Gavin’s unusual skill with the Levitation Charm, transformed the hidden room into a comfortable suite, and began preparing a map.

• Gavin brought pudding and pumpkin juice to the girl, helped her drink, and let her clean the wound on his mouth before she returned his handkerchief for next time.
• After the girl left, Gavin told Gavin Gu that he had met her two years earlier and had never asked her name, age, or house because he thought she might be a magical creature.
• Gavin Gu learned that Gavin’s fear of bullies undermined his spells, while Gavin admitted he could reliably use only the Levitation Charm.
• Gavin demonstrated his Levitation Charm by controlling a detailed battlefield of water soldiers, impressing Gavin Gu with his precise, complex magic.
• Gavin Gu reshaped the hidden room into a comfortable suite, then began drawing up a map before bed.

Snape treated Harley with unusual gentleness during Potions class while criticizing the other students, and he stopped Ron’s pet rat Scabbers from being tested in Ron’s failed Shrinking Solution. The lesson ended with Snape awarding Gavin five points to Slytherin and Harley twenty points to Gryffindor, leaving the class stunned.

• Snape patiently guided Harley through preparing Shrinking Solution, while Gavin watched his favoritism and Snape sharply ordered Gavin to focus on his own work.
• Gavin brewed a flawless potion, and Snape found no errors; Snape also criticized Ron’s poor technique and threatened to test Ron’s failed potion on Scabbers.
• Harley intervened when Snape lifted Scabbers into a testing tray, and Snape released the rat but assigned Ron a two-foot essay on dangerous Shrinking Solution mistakes.
• Gavin stopped Goyle from stealing a sample of his potion, then received five points for brewing a successful batch.
• Snape awarded Harley twenty points despite her cloudy potion, and the stunned class was dismissed.

Gavin confirmed that Ron's current Scabbers was an ordinary rat, then learned that an earlier rat had escaped at Hogwarts and that Sirius still believed Peter Pettigrew was alive. In Lupin's Defense Against the Dark Arts class, Neville failed a rescue exercise and Malfoy abandoned his casualty to attack Lupin, leaving Gavin as the next student to try.

• Gavin examined Scabbers and found no sign of a second heartbeat, concluding that Ron's rat was not Peter Pettigrew.
• Ron told Gavin that an earlier rat named Scabbers had escaped in the Entrance Hall, and Harley explained that Sirius still searched for Peter, who had betrayed the Longbottoms.
• Harley told Gavin that an old wizard in Armenia had cured Lupin's werewolf curse before Lockhart killed him, and that Lupin had remained at Hogwarts to hide from werewolves.
• Lupin set up a rescue exercise, and Neville protected the dummy from a flying chair but lost his wand and failed to carry it across the finish line.
• Malfoy attacked Lupin instead of rescuing the dummy and began casting dangerous dark magic, so Lupin disarmed and restrained him; Malfoy left after saying Bellatrix would not stop either.
• Lupin called Gavin to attempt the exercise, believing he might need to make it easier for him, while Gavin recognized that Lupin was underestimating him.

Gavin used cunning tricks and the Levitation Charm to pass Lupin’s rescue exercise, then watched fourth-year Daiya Rowle complete a flawless demonstration. He learned that Cordelia was supposedly dead, but the other Gavin still planned to visit her, and Gavin agreed to teach him how to fight.

• Gavin used flour, obstacles, and a decoy made from the dummy’s robes to fool Lupin and carry the real dummy across the boundary, becoming the only third-year to pass.
• Daiya Rowle arrived to make up his test and performed a flawless rescue, impressing Lupin and the watching students.
• Gavin learned from Ron that Cordelia had supposedly died at nine alongside her father, though the other Gavin insisted she was alive and still needed food.
• The other Gavin asked Gavin to teach him to fight, and Gavin agreed, explaining that his tricks had all used the Levitation Charm.

Gavin taught Gavin how to use the Levitation Charm in combat and began looking for Hermione’s Time-Turner as a way home. After saving Hermione and Draco from Dementors, he agreed to teach Hermione the Patronus Charm, leaving them set to meet after class the next day.

• Gavin explained that his combat tricks were variations of the Levitation Charm and admitted he had used flour to set up a potentially lethal dust explosion during his demonstration for Gavin.
• Gavin learned from Ron that Hermione was taking every elective, concluded she likely had a Time-Turner, and used his self-made Marauder’s Map to track her.
• Draco confronted Hermione about his fear of Bellatrix and his need to become stronger, then walked away from her toward the Black Lake.
• Two Dementors attacked Hermione and Draco by the lake; Draco collapsed while trying to protect her, and Gavin drove the creatures off with a silver-white seagull Patronus.
• Gavin floated Draco toward the castle and agreed to teach Hermione the Patronus Charm after their last class the next day, while asking her to report the Dementors to Professor McGonagall.