Chapter Summaries

Lockhart’s theatrical lesson left Harry hurt, and Su Er joined Harry, Ron, and Hermione as they planned to investigate Malfoy. The group began preparing to brew Polyjuice Potion despite Su Er’s warnings, leaving their attempt to discover whether Malfoy was the Heir of Slytherin underway.

• Lockhart acted out his werewolf story by pinning Harry down and hurting him, then assigned the class a poem about his victory over the Wagga Wagga Werewolf.
• Su Er waited for Hermione, Harry, and Ron after class and offered them Lockhart-signed slips for borrowing books from the Restricted Section.
• Hermione borrowed Moste Potente Potions, and the group met in a hidden room after Ron and Su Er refused to use Moaning Myrtle’s bathroom.
• Hermione said she intended to brew Polyjuice Potion to investigate Malfoy, whom Harry and Ron suspected of being the Heir of Slytherin.
• Su Er warned Hermione about the potion’s dangers but eventually agreed to let her try, while deciding not to interfere with the story’s course.

Hermione, Harry, Ron, and Su Er planned to brew Polyjuice Potion, and Su Er arranged for Hagrid to obtain the ingredients. The chapter ended as the Gryffindor–Slytherin Quidditch match began, with Harry and Malfoy racing for position.

• Hermione explained that Polyjuice Potion would take about a month to brew, while Harry and Ron reluctantly agreed to help obtain ingredients from Snape’s storeroom.
• Su Er suggested buying the rare ingredients instead and persuaded Harry to pay, then proposed asking Hagrid to get them.
• Su Er asked Hagrid to buy potion ingredients, claiming he wanted to experiment with recipes, and Hagrid agreed to bring them from Hogsmeade.
• Su Er bet five Galleons on Gryffindor before the teams gathered for their match against Slytherin.
• Madam Hooch started the Quidditch match, and Harry flew into the highest position with Malfoy close behind as Lee Jordan began commentating.

During a Quidditch match, a bewitched Bludger relentlessly pursued Harry until he fell and caught the Golden Snitch, winning the game but breaking his arm. Su Er, Hermione, and Ron took him to the Hospital Wing, while Su Er noticed Colin Creevey heading there and worried that he might become the next victim.

• Lee Jordan and the Gryffindor players noticed that a Bludger was targeting Harry, but the match resumed after a rain delay.
• Harry fell from his broom while catching the Golden Snitch, giving Gryffindor the win and breaking his arm.
• Lockhart tried to mend Harry's arm but removed its bones, so Su Er and Hermione helped Harry reach Madam Pomfrey.
• Madam Pomfrey kept Harry in the Hospital Wing overnight and sent Su Er, Hermione, and Ron away.
• Colin Creevey told Su Er he was going to photograph Harry, and Su Er worried that Colin would become the next victim.

Su Er brought Hermione to the Room of Requirement so they could brew Polyjuice Potion in secret, and they began preparing ingredients there. Meanwhile, Harry recovered from Lockhart’s botched treatment and searched the Castle for his friends so he could tell them what he had overheard.

• Su Er received potion ingredients from Hagrid and told him that Lockhart had removed all the bones from Harry’s arm.
• Su Er led Hermione to the Room of Requirement on the Seventh Floor and showed her the potion-brewing room it provided.
• Hermione was annoyed that Su Er had known about the room for a year without telling her, but his explanation calmed her.
• Su Er and Hermione began preparing ingredients for Polyjuice Potion, with the bicorn horn still missing.
• Harry’s bones regrew overnight, and after leaving the Hospital Wing he searched the Castle for Su Er and the others.

Hermione and Su Er continued preparing the Polyjuice Potion in secret while Harry revealed that Dobby had confirmed the Chamber of Secrets had been opened before. As fear spread after Colin Creevey’s attack, Su Er pursued his Animagus preparations and considered where to brew the transformation potion.

• Hermione finished the preliminary work on the Polyjuice Potion and agreed to stay at school over Christmas, while Su Er planned to visit home and deliver her present to Angel.
• Harry told Hermione, Ron, and Su Er that Dobby had warned him Hogwarts was dangerous and revealed that the Chamber of Secrets had been opened before; Ron blamed Lucius Malfoy and Draco, but Su Er privately knew they were wrong.
• News spread that Colin Creevey had been attacked, prompting fear among the students and leading Fred and George to sell protective amulets based on Su Er’s idea in exchange for giving him thirty percent of the profits.
• Su Er collected Bicorn Horn powder from Hagrid and refused to take the whole horn, then received his share of the amulet profits from Fred and George.
• Su Er kept a Mandrake leaf beneath his tongue as part of his Animagus preparations and began looking for a quiet, dark place to brew the transformation potion.

Hermione and Su Er made progress brewing Polyjuice Potion while Su Er prepared to enter the Forbidden Forest on the full moon. He left Fang at the familiar spot where they had encountered Old Voldy, with the unicorn’s remains gone.

• Hermione and Su Er added the final ingredients to the Polyjuice Potion and left it to simmer for two weeks.
• Su Er noticed the full moon and planned to use the Forbidden Forest, arranging Fang’s help in advance.
• Su Er learned that the Duelling Club would meet that evening but skipped it to pursue his own plans.
• Su Er borrowed Harry’s Invisibility Cloak, fed Fang, and quietly freed him from his chain while Hagrid drank inside his hut.
• Su Er and Fang followed a quiet route into the Forbidden Forest and reached the place where they had encountered Old Voldy, finding the unicorn’s corpse and blood gone.

Su Er prepared an Animagus Potion in the Forbidden Forest while Harry’s Parseltongue ability was revealed at the Castle. He buried the potion to await a thunderstorm and returned to Hogwarts with Fang, leaving the potion to mature.

• Su Er fed Fang and waited in a moonlit clearing for the Mandrake leaf to absorb the moonlight, while reflecting on Harry and Justin’s coming encounter with the Basilisk.
• Malfoy summoned a snake with Serpensortia, Lockhart accidentally enlarged and enraged it, and Harry spoke to it in Parseltongue to stop it attacking Justin Finch-Fletchley.
• Su Er added his hair, dew, and a Death’s-head Hawkmoth Pupa to the restored Mandrake leaf and buried the finished potion in the Forbidden Forest.
• Su Er asked Fang to remember the hiding place, then returned to Hagrid’s Hut under the Invisibility Cloak and put Fang back on his chain.
• Hagrid later found Fang eating meat and wondered when he had fed him.

Su Er misunderstood Morn comforting a tearful Justin and accidentally hit Morn with a Full Body-Bind Curse before learning why Justin feared the Heir of Slytherin. After Herbology was canceled because of the snow, Su Er asked Cedric to teach him the Disillusionment Charm and eagerly agreed despite its limitations.

• Su Er saw Morn comforting Justin, panicked, and cast Petrificus Totalus on Morn before lifting the spell and apologizing with two Honeydukes gift hampers.
• Morn explained that Justin feared Harry was the Heir of Slytherin and had targeted him because he came from a Muggle family.
• Su Er went to the greenhouses after overnight snowfall, but Professor Sprout had canceled Herbology to care for the mandrakes.
• Su Er borrowed Advanced Charms Explained and asked Cedric to teach him the Disillusionment Charm.
• Cedric described the charm's limits and high magical cost, but Su Er insisted that he wanted to learn it.

Su Er practiced the Disillusionment Charm with Cedric and continued his Animagus preparations. When Justin vanished from the dormitory, Su Er joined Morn, Ernie, and other students in searching the Castle, where they encountered Hagrid carrying a dead rooster.

• Cedric coached Su Er through the Disillusionment Charm, and they discussed ways to combine spells safely.
• Su Er practiced the charm and recited the Animagus incantation at dusk, but noticed no change.
• Su Er discovered that Justin's bedding had been moved and learned from Morn that Ernie had asked Justin to hide in his dormitory.
• Ernie reported that Justin had disappeared, and he, Morn, Su Er, and other students split into groups to search the Castle.
• Su Er met Hagrid, who said a second rooster had been killed and that he was seeking permission to protect the henhouse with a spell.

After Justin and Nearly Headless Nick were petrified, panic spread through Hogwarts and Harry faced growing suspicion. Su Er later heard Hermione describe Fred and George’s mockery of Harry, then teased Hermione until she blushed while they worked on a potion.

• Peeves announced that Harry had struck someone, and students rushed into the corridor to find Justin and Nearly Headless Nick petrified.
• Professor McGonagall ordered Professor Sinistra and Professor Flitwick to take Justin to the Hospital Wing, then had Su Er and Ernie fan Nick there.
• The attacks fueled fear at Hogwarts, and many students tried to reserve seats on the Hogwarts Express so they could leave early for Christmas.
• Hermione told Su Er that Fred and George mocked Harry by announcing that the Heir of Slytherin was coming through.
• Su Er laughed at Hermione’s imitation, then called her cute until she blushed and ordered him to keep stirring the potion until the end of the day.

Su Er returned home for Christmas, but found his family away and the house key missing, leaving him stranded outside. Mrs. Granger gave him the spare key, and Su Er finally went to sleep alone in the quiet house.

• Su Er arrived at the station and realized that Mrs. Ellison and Angel were away on a trip until Christmas Day.
• Unable to find a taxi, Su Er took the Knight Bus home and endured its chaotic journey.
• Su Er discovered that the key was missing from its hiding place and waited outside, too tired and cold to leave.
• Mrs. Granger heard Su Er outside, invited him in for hot milk, and gave him the key his mother had left with her.
• Su Er returned to his empty home, missed Angel, and fell asleep after washing up.

Su Er spent Christmas Eve preparing decorations and presents while waiting for his family to return from Germany, and he sent letters and gifts to Hermione and Hagrid. The next morning, Angel appeared at his bedroom door, though Su Er was surprised because he thought she was still abroad.

• Su Er read Hermione's letter about the Polyjuice Potion and her plan to act against Malfoy, then wrote back and asked Little Gray to carry another reply later.
• Su Er bought Christmas decorations and presents, then decorated a spruce tree by himself while his family remained away.
• Su Er visited the Grangers, delivered Hermione's letter and gifts, and received a reply from Mr. Granger.
• Su Er sent Little Gray off with the replies and Hagrid's Christmas present, then went home and slept.
• Angel appeared at Su Er's bedroom door the next morning, and Su Er realized she had returned earlier than expected.

Su Er returned to Hogwarts after Christmas and explored Hogsmeade with Hagrid before running into Professors Flitwick and McGonagall at the Three Broomsticks. The chapter ended with Flitwick offering him a cherry syrup and soda.

• Su Er spent Christmas with the Ellisons and Grangers, while Hermione still had not written back.
• A few days after Christmas, Su Er left home and drove back toward Hogwarts after saying goodbye to Angel.
• Hagrid met Su Er at the station and showed him around Hogsmeade, where Su Er bought two quills and received sticky toffee from Honeydukes.
• Hagrid pointed out the Shrieking Shack and told Su Er that Hogwarts students could visit Hogsmeade from their third year onward.
• At the Three Broomsticks, Su Er met Professor Flitwick and Professor McGonagall, and Flitwick offered him cherry syrup and soda.

Su Er met Professor Flitwick at the Three Broomsticks, where Flitwick invited him to extra lessons and agreed to teach him the Patronus Charm. He introduced Su Er to Pix, who demonstrated a vivid silver squirrel Patronus.

• Professor Flitwick invited Su Er to attend advanced lessons on Saturday afternoons.
• Su Er asked Professor Flitwick about the Patronus Charm and arranged to visit his office the next day for instruction.
• Professor Flitwick introduced Pix as a specialist in emotion-based magic who was exceptionally skilled at casting Patronuses.
• Pix conjured a silver squirrel Patronus, which delighted Su Er before it faded away.

Su Er and the drunken Hagrid spent the night at the filthy Hog's Head after the pub's owner, Forth, gave them a room. The next morning, Su Er glimpsed a painting of a girl in Forth's room, but Forth chased him away when he asked for breakfast.

• Hagrid was too drunk to return to the Castle, so he led Su Er to the Hog's Head and called for its owner, Forth.
• Forth charged them five Galleons for a night in an upstairs room and warned that he did not welcome young wizards.
• Su Er found mice in his bed, cleaned a chair with Scourgify, and slept curled up on it while Hagrid snored.
• At five in the morning, Su Er went downstairs looking for breakfast and saw Forth standing before a painting of a smiling girl beside a wooden house.
• Forth caught Su Er peering into the room, refused to serve breakfast, and slammed the door; Su Er cursed him under his breath.

Su Er returned to Hogwarts and learned from Moaning Myrtle that Ginny had visited her bathroom and dropped a book there. He asked Myrtle to guard the book, hoping it would reveal more about the Heir of Slytherin.

• Su Er left Hagrid and Fang, returned to the Hufflepuff common room, and hurried out after remembering the catgirl.
• Moaning Myrtle told Su Er that Harry Potter was being called the Heir of Slytherin and that she had seen a young witch transform with him during the Christmas holidays.
• Myrtle described the witch's black fur, ears, and tail, then recalled seeing two boys and a girl drinking a potion in her bathroom.
• Myrtle said a hooded, red-haired witch with chicken feathers had dropped a book on her head after Christmas.
• Su Er suspected the witch was Ginny and asked Myrtle to keep the water-soaked book safe.

Su Er rushed to the Hospital Wing to see Hermione, who had transformed into a catgirl after her Polyjuice Potion attempt. His effort to sneak a look at her ended with Hermione striking him in the chest, and he accused her of trying to murder her husband.

• Su Er hurried past Harry and Ron and went to the Hospital Wing to visit Hermione.
• Madam Pomfrey scolded Su Er for running before allowing him to enter Hermione's ward.
• Hermione briefly revealed her cat ears and eyes, then hid in embarrassment and refused to let Su Er come in.
• Su Er left Hermione biscuits and secretly waited until she emerged to eat one.
• Hermione caught Su Er watching her, became furious, and struck his chest with a cat-head strike.

Su Er visited Hermione after her catlike Polyjuice transformation, teased her by touching her ears, and then agreed to help Harry and Ron deal with Crookshanks and Scabbers. After recognizing Ron’s rat, Su Er went with them toward the Gryffindor Common Room, suspecting there was more to Scabbers than Ron knew.

• Hermione said her investigation had gone poorly, and Su Er offered to share notes from Professor Flitwick’s lessons and teach her the Patronus Charm.
• Su Er asked Hermione to close her eyes as a reward, touched her cat ears, and hurried away before she could react.
• Su Er headed to lunch, planning to retrieve a notebook from Moaning Myrtle and learn the Patronus Charm from Flitwick.
• Harry asked Su Er to come to the Gryffindor Common Room and help with Crookshanks, while Ron complained that the cat was frightening Scabbers.
• Su Er recognized Scabbers as the rat with a missing toe, defended Crookshanks, and agreed to go with Harry and Ron after lunch.

Su Er retrieved the tattered diary from Moaning Myrtle’s bathroom and recognized it as T. M. Riddle’s Horcrux. He left intending to secure it and give it to Dumbledore, while a red-haired figure later entered the bathroom.

• Su Er left the Gryffindor Common Room with Crookshanks, who wanted to return and hunt Ron’s rat, but Su Er carried him to the Hufflepuff common room instead.
• Su Er distracted Filch with a Dungbomb and an explosion, then entered Moaning Myrtle’s bathroom.
• Moaning Myrtle showed Su Er the soaked black notebook and reminded him of his promise.
• Su Er tested the notebook with spells, put on Dragonhide Gloves, and found the name T. M. Riddle inside.
• Su Er pocketed the diary and left to find a way to hand it to Headmaster Dumbledore.
• A red-haired figure entered the bathroom after Su Er left, and a sound like sobbing came from inside.

Su Er hid Tom Riddle’s diary in the Room of Requirement while he waited to tell Dumbledore about the Horcrux, then went to Professor Flitwick to learn about the Patronus Charm. Flitwick explained the charm’s emotional basis and demonstrated its wand movement, leaving Su Er ready to begin practicing.

• Su Er decided to seek Dumbledore’s help about the Horcrux, accepting that Dumbledore might uncover his secrets, but found the Headmaster away from the Castle.
• Su Er hid the diary inside nested, locked boxes in the Room of Requirement and disguised the outer box among the room’s clutter.
• Tom Riddle emerged from the diary and found himself trapped in the Room of Requirement, confused about how he had arrived there.
• Su Er met Professor Flitwick, who explained that a Patronus reflected a wizard’s positive emotions and had a unique form and personality.
• Professor Flitwick taught Su Er that happiness was central to casting the Patronus Charm and demonstrated its gentle wand movement.