Chapter Summaries

Arthur Weasley and the employees of the Misuse of Muggle Artifacts Office resigned to protest Dolores Umbridge’s attempt to harm children and to disrupt the Ministry’s investigation of Lin Yue. Lin Yue learned that the Weasleys could afford Arthur’s time off and offered the former department staff future work selling her magic-tech products in the Muggle World.

• Lin Yue realized Arthur might resign because the Ministry’s investigation of her products fell under his department, and worried about the Weasleys’ finances.
• Arthur told Umbridge that he and the entire Misuse of Muggle Artifacts Office staff had resigned after she tried to harm his child with a Dark Magic item.
• Hermione suggested Lin Yue hire Arthur and his colleagues to help bring her magic-tech products to the Muggle World, and Lin Yue thanked her with a kiss.
• Arthur explained that the staff had resigned partly to hinder the Ministry’s investigation and support Lin Yue’s work, while the Weasleys assured Lin Yue that lower prices had helped them save money.
• Lin Yue offered Arthur and the former staff jobs marketing her products after their time off, and Arthur agreed; Lin Yue then thanked Sirius and Harry and said her friends and family had helped her feel alive again.

Lin Yue addressed British Muggle officials’ concerns by explaining how her magical products would protect workers while improving everyday life. After reading her letters and trying the products, Eddie B. Dillos and his wife Melor decided he should support her efforts, leaving him ready to act despite his fear of failure.

• With the Ministry’s Misuse of Muggle Artifacts Office emptied by resignations, Fudge struggled to rebuild it while Lin Yue faced no magical opposition to her products.
• Lin Yue let Mother Rowena and Mother Helga handle financial traps and wrote to skeptical officials, explaining her plans to lower prices and protect workers’ livelihoods.
• Lin Yue and Hermione discussed identifying which MPs genuinely cared for the public, and Lin Yue predicted Hermione would eventually lead both the magical and Muggle governments.
• Lin Yue sent Eddie B. Dillos daily letters and enchanted products, including assurances that her factories would employ workers displaced by existing industries.
• Melor read Lin Yue’s letters and tested the enchanted kitchenware, then urged Dillos to support Lin Yue despite the risk of failure.
• Dillos embraced Melor and thanked her for helping him take the step he had already decided to take.

Lin Yue and Hermione celebrated Mr. Dillos agreeing to help their products enter Country Y’s Muggle market, but their good mood faded when Umbridge became Hogwarts High Inquisitor and issued a decree restricting students’ relationships. Professor McGonagall defended students who defied the decree and announced that Hogwarts would teach them about healthy relationships.

• Lin Yue told Hermione that Mr. Dillos had agreed to help lobby Parliament so their products could enter Country Y’s Muggle market.
• Lin Yue, Hermione, Marietta, and Qiuzhang saw that Umbridge had been appointed Hogwarts High Inquisitor and learned she had issued a decree requiring students to keep their distance from one another.
• Hogwarts’ four Heads of House rejected the decree, and students ignored it as Hanks and Bayes sat together holding hands.
• Umbridge ordered Filch to take Hanks and Bayes to detention for violating the decree, but Bayes challenged her authority and Lin Yue sent Filch flying.
• Professor McGonagall told Umbridge she had overstepped her authority, then announced that Hogwarts would add lessons on healthy relationships to the curriculum.

After deciding Filch’s hostility toward Hogwarts students made him a potential liability, Lin Yue confronted him in his office and demanded that he change. Filch agreed to stop being hostile, but Lin Yue warned him she would be watching.

• At dinner, Lin Yue told Hermione, Qiuzhang, and Marietta that Filch’s hostility could endanger Hogwarts and that she planned to speak with him.
• Lin Yue reasoned that Filch was likely a Squib whose jealousy and resentment toward young wizards had led him to side with Umbridge.
• After dinner, Lin Yue went alone to Filch’s office and calmly defended having thrown him out earlier, then accused him of siding with the Ministry against Hogwarts.
• Lin Yue warned Filch that he would have to leave Hogwarts if he remained hostile, though she would find him another job.
• Filch promised to stop being hostile toward the young wizards, and Lin Yue left him collapsed in his chair beside Mrs. Norris.

Lin Yue agreed to teach Defense Against the Dark Arts as Hogwarts students united against Umbridge’s policies. She joined Penelope and her friends in Hogsmeade to celebrate Penelope’s birthday, where Penelope drank Firewhisky and Luna carried her home after she fell asleep.

• The Ravenclaw students asked Lin Yue to teach Defense Against the Dark Arts, and she agreed; Penelope arranged for a notice to be posted.
• Penelope reminded Lin Yue, Hermione, Qiuzhang, and Marietta of their promise to celebrate her coming of age with real alcohol, and said her birthday was that Saturday.
• Filch kept his distance from Umbridge after Lin Yue warned him, while McGonagall and Sprout finalized the Love Education Class schedule.
• Students from all four Houses signed up for Lin Yue’s Defense Against the Dark Arts lessons, and the Little Eagles posted a notice that Umbridge passed and read.
• At The Three Broomsticks, Penelope drank her Firewhisky and fell asleep; Lin Yue confirmed she was drunk but not dangerously ill, and Luna carried her out.

Lin Yue and Hermione explored the Hog's Head before rejoining Qiuzhang and Marietta, who explained that Umbridge had ordered all student groups to disband. With students from nearly every house joining their Defense lessons, they named the organization Dumbledore's Army and left Lin Yue to choose a meeting place.

• Lin Yue assessed a hooded wizard at the Hog's Head as likely a Dark Wizard, and Hermione agreed that something seemed off about him.
• Qiuzhang and Marietta told Lin Yue and Hermione that Umbridge had ordered every student organization and interest club to disband.
• Qiuzhang and Marietta proposed that Lin Yue teach the fifth- and seventh-years while other students taught the remaining years, but Lin Yue insisted on teaching the sixth-years too.
• Hermione suggested naming the large Defense group Dumbledore's Army, and Qiuzhang wrote the name on a roll of parchment.
• Qiuzhang asked Lin Yue to choose a meeting place, and Lin Yue considered the options.

Lin Yue and Hermione went to watch Gryffindor's Quidditch tryouts and helped Ron overcome his nerves before the Keeper selection. Ginny then asked Lin Yue how she assessed players, but Lin Yue's explanation of calculating physical attributes proved too difficult for Ginny to understand.

• Lin Yue identified the Room of Requirement as a suitable meeting place, and Harry invited Hermione to watch Gryffindor's Quidditch tryouts with him.
• Lin Yue and Hermione attended the tryouts, where Ginny told them she had tried out for Chaser the day before.
• Lin Yue predicted that Fred and George would be selected as Beaters and that Ron had a strong chance of becoming Keeper.
• Hermione encouraged Ron to stop worrying, and Lin Yue calculated that his chances of selection would improve if he calmed down.
• Ron regained his confidence and joined the Keeper candidates, while Harry continued the Beater tryouts.
• Ginny asked Lin Yue to explain how she assessed Quidditch players, but she could not follow the calculations.

After Ron won the Gryffindor Keeper tryouts, Umbridge banned Harry from playing Quidditch, claiming she had the authority under a new school notice. Lin Yue and the others recognized the ban as an attempt to target Harry, while the Slytherins resented Umbridge for trying to court them through her scheme.

• The Weasley Twins won the Gryffindor Beater positions, and Ron secured the Keeper spot after a strong tryout.
• Lin Yue, Hermione, and Ginny congratulated Ron, then learned from Qiuzhang and Marietta that he had made the team.
• At dinner, Qiuzhang noticed Umbridge speaking to Harry, and Lin Yue read her lips as she announced Harry was banned from Quidditch until he admitted he had lied.
• Penelope explained that Umbridge had posted a notice granting herself power to ban students from school Quidditch matches.
• Lin Yue deduced that Umbridge planned to lock Harry's Firebolt in her office, while the Slytherins took offense at Umbridge's apparent attempt to win their support.

Harry handed Umbridge his Firebolt to stop her bothering him, then summoned it back and played in the Gryffindor–Slytherin Quidditch Match. Meanwhile, Lin Yue taught the fifth-years defensive spells and watched the match, where Ron’s nerves threatened his performance.

• Harry told Ron that he had given Umbridge the Firebolt only to get some peace and would use the Accio Charm to retrieve it for the match.
• Lin Yue and Hermione prepared the Room of Requirement, and Lin Yue led the fifth-years through an intensive evening of defensive spell practice.
• On Saturday, Harry led Gryffindor onto the pitch, and Lin Yue bound Umbridge to her seat when she tried to interfere.
• Harry summoned his Firebolt with the Accio Charm, and Madam Hooch started the match.
• Lin Yue and Hermione noticed that Ron was too tense to play well, and Lin Yue expected Harry to call a time-out.

During a Quidditch match, Lin Yue helped Ron overcome his nerves with a calming trick disguised as a spell, and Gryffindor defeated Slytherin. Afterward, her friends celebrated that she had told her first lie and continued making progress.

• Harry called a time-out and tried to reassure a nervous Ron before the match resumed.
• Lin Yue used a fake incantation and warm light to help Ron calm down, then explained to Hermione that she had combined Lumos, the Warming Charm, and psychological suggestion.
• Ron defended Gryffindor’s goalposts, and Harry caught the Golden Snitch to win the match against Slytherin.
• Harry praised the Slytherin players, and Hermione and Ron agreed that the Houses should show one another goodwill.
• Lin Yue told Ron that her spell had been a trick, and Harry and Ron delighted in realizing that she had lied for the first time.
• Harry and Ron planned a celebration for Lin Yue’s progress and their victory, while Fred and George congratulated her and promised sweets.

Lin Yue celebrated her progress with her friends, then offered to finance Fred and George’s Diagon Alley Joke Shop and a competing Hogwarts effort to counter their products. The chapter ended the next morning with Hermione greeting Lin Yue affectionately as she studied.

• Lin Yue ate a Cockroach Cluster and described real cockroaches so vividly that Harry, Ron, and Ginny felt sick.
• Qiuzhang, Marietta, Penelope, and Luna celebrated Lin Yue’s progress, and Luna said only a little remained of what Lin Yue was dragging around.
• Lin Yue offered Fred and George seven thousand Gold Galleons to open their Joke Shop and access to her Factory to develop and improve products.
• Lin Yue proposed funding an independent Hogwarts partnership to counter the twins’ products, and Fred and George agreed to work with her.
• Lin Yue led her friends back to Ravenclaw Tower after the celebration, then studied the next morning until Hermione woke and kissed her.

Lin Yue, Hermione, Harry, and Ron discussed the coming war and Harry’s reluctance to kill Death Eaters, then visited Hagrid, whose injuries Lin Yue healed. Hagrid reported that Giant warmongers had killed their former leader and sided with Voldemort, while Lin Yue learned that Dementors remained mostly stable but Death Eaters had begun approaching them.

• Harry and Ron told Lin Yue and Hermione that Hagrid had returned, and Lin Yue warned that Giant warmongers would likely side with Voldemort.
• Hermione and Lin Yue told Harry that he could not endanger himself by holding back against Death Eaters, though they did not require him to use a killing curse.
• Lin Yue sent a letter to Platt seeking Werewolf blood, then accompanied Hermione, Harry, and Ron to visit Hagrid.
• Lin Yue healed Hagrid’s injuries with Episkey after he revealed that Giant warmongers had killed the former leader and forced the clan toward Voldemort.
• Hagrid said most Giants opposed joining Voldemort, and Lin Yue concluded that only a few leaders needed to be dealt with.
• Lin Yue reported that Dementors were stable for now but Death Eaters had begun approaching them, and Hermione vowed to find a way to control the Dementors.

After hearing Hagrid’s account of the Giants, Harry dreamed through Voldemort’s snake and glimpsed a mysterious corridor. Lin Yue warned Harry that Voldemort might use their connection to lure him out of Hogwarts, and Harry agreed to consult her before acting on future dreams.

• Hagrid told Lin Yue, Hermione, and the others about the Giants’ takeover and his own childhood, prompting Harry to understand why they could not show mercy to Voldemort’s followers.
• Harry fell asleep and dreamed that he was Voldemort’s giant snake slithering through a corridor toward a door, but Ron woke him before he could see what was inside.
• Harry told Ron that the dream might let him learn useful information about Voldemort, and Ron urged him to ask Lin Yue for advice.
• Lin Yue explained that Harry and Voldemort could share senses because the snake had become one of Voldemort’s Horcruxes, and cautioned that Voldemort might fabricate visions to lure Harry from Hogwarts.
• Lin Yue told Harry to contact her on his Communicator if he had another such dream, while Hermione reminded Harry and Ron to consult their friends and professors instead of acting impulsively.

Lin Yue analyzed Harry’s recurring dreams and identified the corridor as part of the Ministry of Magic’s Department of Mysteries, where Voldemort’s snake had been roaming. She concluded Voldemort was steering Harry toward something in the department and arranged for someone to watch it before an incident could occur.

• Lin Yue compared her drawings of Harry’s dreams and reconstructed a blurred door symbol as the Ministry of Magic’s insignia.
• Lin Yue deduced that Voldemort wanted something behind one of the corridor’s doors and was guiding Harry toward it through his dreams.
• Lin Yue asked a Ravenclaw senior who worked at the Ministry to identify the corridor, and the senior replied that no known department matched it.
• Lin Yue ruled out the Ministry’s other locations and identified the Department of Mysteries as the corridor’s likely location.
• Lin Yue wrote to Senior Platt and asked her to arrange for someone to watch the Department of Mysteries.

Lin Yue’s contacts entered the Department of Mysteries, and Harry learned that Mr. Weasley had been attacked by Voldemort’s snake. Because Lin Yue’s people stopped the bleeding and took Mr. Weasley to St Mungo’s, the Weasley family and their friends prepared to visit him.

• Senior Platt told Lin Yue that four Ravenclaw graduates had entered the Department of Mysteries and were keeping watch in shifts.
• Sirius replied to Harry that he would discuss Harry’s dreams with Headmaster Dumbledore, while Harry kept his Horcrux secret from him.
• Lin Yue heard from Senior Platt that Mr. Weasley had been attacked, but Dillos had stopped the bleeding and he was out of danger at St Mungo’s.
• Harry told Ron that he had seen Mr. Weasley’s attack, and Lin Yue reassured Harry that her contacts had treated him and taken him to the hospital.
• Professor McGonagall arranged for Ron, Ginny, Fred, George, Harry, Hermione, and Lin Yue to go to St Mungo’s, then complained about the Ministry sealing Hogwarts’s fireplaces.

Lin Yue and Professor McGonagall brought the Weasleys to St Mungo's to visit Arthur, who had survived Nagini's attack. Lin Yue captured Nagini and promised to find a way to restore her, while Hermione noticed Lin Yue's mysterious smile and suspected she had a secret plan for the Horcrux inside the snake.

• Fred, George, Ron, and Lin Yue reassured Ginny and Harry that Arthur was safe before Professor McGonagall led them to St Mungo's.
• Lin Yue explained that she had funded St Mungo's renovation and installed its elevators, then the group visited Arthur in Room 503.
• Lin Yue thanked four Ravenclaw seniors for capturing Voldemort's snake, and she recognized the creature as a Blood Curse Beastman.
• Professor McGonagall identified the snake as Nagini and explained that she had once been a kind young woman whom Voldemort had turned into a weapon.
• Lin Yue stunned Nagini through the seniors' barrier, sent her to Ravenclaw Castle, and promised to find a way to restore her.
• Hermione noticed Lin Yue's fleeting smile and wondered how she planned to deal with the Horcrux inside Nagini without killing her.

After Nagini was captured and Arthur Weasley was rescued, Lin Yue kept a secret plan from everyone except Hermione while promising Professor McGonagall she would seek a cure for Nagini’s Blood Curse. The chapter ends with Lin Yue entering Ravenclaw Castle through a hidden passage after classes.

• Mrs. Weasley thanked Lin Yue for saving Arthur, and Lin Yue gave four Ravenclaw students research notebooks before they left St Mungo’s.
• Arthur, Mrs. Weasley, and Percy persuaded the Weasley children to return to Hogwarts, while Hermione confronted Lin Yue about her secret plan and agreed not to ask for details.
• Neville waited in the Gryffindor Common Room until the group returned, and Professor McGonagall asked Lin Yue to help Nagini find peace if the Blood Curse could not be broken.
• Qiuzhang and Marietta waited up to hear about Arthur, and Lin Yue and Hermione went to sleep together in Lin Yue’s bed.
• Harry told Lin Yue and Hermione that he had not dreamed the previous night, and they warned him to seek help if Voldemort lured him through another dream.
• After her morning classes, Lin Yue entered a hidden passage and arrived outside Ravenclaw Castle.

Lin Yue extracted the Blood Curse magic from a piece of Nagini’s flesh, proving that the curse could be removed but that doing so required exhausting precision and strength. She began designing a specialized spell and considered whether it could also remove Werewolf Toxin.

• Lin Yue visited Ravenclaw Castle, took a piece of Nagini’s flesh, and returned to Hogwarts.
• Lin Yue used spells to discover that red Blood Curse magic permeated every cell in the sample and was still active.
• Lin Yue used the Levitation Charm to extract all the Blood Curse magic from the flesh, then burned the extracted magic away.
• Hermione, Qiuzhang, and Marietta caught Lin Yue as she stumbled, and Lin Yue confirmed that she had broken the Blood Curse in the sample.
• Lin Yue explained that the method needed a more efficient spell, and she planned to build one from the Levitation Charm and Ancient Runes.
• Lin Yue considered adapting the spell to remove Werewolf Toxin as well, pending samples from Senior Platt.

Lin Yue studied the Werewolf Toxin and continued developing cures for it and the Blood Curse while she and Hermione returned to the Granger family home for Christmas. There, Hermione learned Lin Yue had arranged powerful protections for her parents and planned to make them available across Country Y, leaving the girls warmly reunited with the Grangers and confident about their future.

• Lin Yue received fifty werewolf blood samples from Senior Platt, confirmed the Werewolf Toxin acted as a poison, and began developing spells to remove it and the Blood Curse.
• Hermione thanked Lin Yue for giving her confidence to spend Christmas with her parents despite Voldemort's return, and Lin Yue promised to protect them.
• Lin Yue and Hermione arrived at King's Cross and reunited with Mr. and Mrs. Granger before heading to their home.
• Hermione discovered Lin Yue had surrounded the Granger home with a missile-resistant magical gate and wall that prevented Apparition, Portkeys, and broomstick entry.
• Lin Yue explained that protective products would be offered free to ordinary households across Country Y, with wealthy customers paying for custom versions, and Hermione agreed to announce them.
• Mr. and Mrs. Granger watched Hermione and Lin Yue embrace and imagined attending their wedding in a few years.

Lin Yue and Hermione celebrated Christmas with the Grangers, then visited the Weasleys and accompanied them to St Mungo's Hospital for Magical Maladies and Injuries. There, they found Neville visiting his parents and were greeted by him as he worried that one of his friends was ill or hurt.

• Lin Yue gave the Grangers bracelets that would transport them to Ravenclaw Castle if they were in danger, and Hermione read that Mr. Weasley had been discharged for Christmas.
• Lin Yue, Hermione, and the Grangers enjoyed Christmas dinner and watched snow fall before Lin Yue and Hermione planned to visit Mr. Weasley.
• Lin Yue and Hermione used the Floo Network to arrive at 12 Grimmauld Place, surprising the Weasleys, Harry, and Sirius.
• The group went to St Mungo's Hospital for Magical Maladies and Injuries for Mr. Weasley's checkup, while Lin Yue, Hermione, Harry, and Ron explored the hospital.
• Lin Yue, Hermione, Harry, and Ron followed Neville's voice and found him with his parents; Neville then spotted them and anxiously asked whether someone was ill or hurt.