Chapter Summaries

Ron searched Hogwarts for Scabbers and grew increasingly convinced that the visiting foreigners had taken him. At the welcome banquet, Harry saw Lucius Malfoy and two unfamiliar Pure-blood guests at the professors’ tables, while Draco covertly warned him about their presence.

• Ron discovered Scabbers missing and blamed the visiting foreigners, while Neville also realized Trevor was gone.
• Hermione said the castle’s awakened statues had guarded every entrance, and revealed that Fred and George had been caught sneaking out.
• Professor Sprout and Hagrid prepared international flowers for the banquet, and Hagrid suggested asking Vaughn’s cat to find Scabbers; Ron refused and accused Vaughn of mistreating the mouse.
• Harry, Ron, and their friends searched Hogwarts without finding Scabbers, and Ron grew more suspicious of the foreigners and other students.
• Harry and Ron entered the lavishly decorated Great Hall, where Draco mocked them and claimed his father and other Pure-blood Families had lent the decorations.
• Draco covertly drew Harry’s attention to Lucius Malfoy and two unfamiliar wizards, and one of the guests noticed Harry watching him.

Lucius and Jacob Rosier discussed Snape and the hidden North American guests, unaware that Hogwarts portraits were spying on them. In Dumbledore’s office, Vaughn accused Dumbledore of planning to use Snape to draw Tom out, and Dumbledore asked Vaughn to reveal the identity of his Death Eater, but Vaughn refused without a better offer.

• Jacob Rosier asked Lucius whether Harry was unusual, and Lucius described him as an average student with little magical talent.
• A hidden portrait recorded Lucius and Jacob discussing Snape and the North American guests, then showed the scene to Dumbledore and Vaughn.
• Dumbledore and Vaughn agreed that Lucius and Jacob might meet the guests that night, while Tom remained their main concern.
• Vaughn accused Dumbledore of intending to use Snape to help bring Tom back, and Dumbledore acknowledged the possibility while questioning Vaughn’s view of human nature.
• Dumbledore demanded the identity of Vaughn’s controlled Death Eater, but Vaughn said the information was tied to an old matter and that Dumbledore’s offer was insufficient.

Hogwarts welcomed the delegations for the International Magical School Potions Exchange, and Harry watched as Dumbledore introduced the visiting schools and their leaders. The Central Academy of Qi Practitioners delegation joined the Gryffindor table, where Quan Dao Cheng insulted Ron and complained about the food.

• Harry worried about Lucius Malfoy's purpose at Hogwarts and considered approaching Draco, while trying not to draw the attention of Lucius's vigilant companion.
• Dumbledore and Vaughn led the professors and delegations into the Great Hall, and Dumbledore began introducing the exchange's participants.
• The Beauxbatons, Durmstrang, Uagadou, Koldovstoretz, Magic Institute, and Ilvermorny delegations were introduced and took seats at the Hogwarts tables.
• Hermione explained Castelobruxo's interest in Vaughn's potion research, and Enrique Yakutin and Yara Silva Yakutin greeted Vaughn warmly.
• Dumbledore introduced Nan Yu Li, whose status as a Legendary Wizard prompted the assembled school leaders to rise and bow.
• Quan Dao Cheng sat between Harry and Ron, mocked Ron as mediocre, and asked Harry whether French food had been prepared.

At the Hogwarts welcome banquet, Cheng Quandao tried to provoke Harry through Ron, while Vaughn and Li Nanyu discussed the Statute of Secrecy and Lucius Malfoy staged a public confrontation with Vaughn. Suspicious of Lucius’s sudden departure with Snape and Jacob Rosier, Harry decided to follow them with Ron and Hermione, despite McGonagall’s order to stay in the Great Hall.

• Cheng Quandao insulted Ron and praised Hermione in a way that Hermione recognized as an attempt to provoke Harry through his friends.
• Li Nanyu and Vaughn criticized the Statute of Secrecy as outdated, drawing guarded reactions from the visiting school officials.
• Lucius Malfoy taunted Vaughn about his ambitions, and Jacob Rosier and Snape escorted Lucius out of the Great Hall.
• Harry noticed Draco’s anxious reaction to Lucius’s departure and told Ron and Hermione he suspected the confrontation was an excuse to leave.
• Harry persuaded Ron and Hermione to quietly follow Lucius, Rosier, and Snape, despite Ron’s protests and McGonagall’s order that students remain at the banquet.

Harry, Ron, and Hermione left the Great Hall under the Invisibility Cloak and followed Guoguo Tea through Hogwarts’s secret passages and into the Forbidden Forest. Using Hermione’s infrared vision charm, they located Lucius Malfoy, Snape, and two other figures in a clearing, but had not yet learned what they were doing.

• Harry, Ron, and Hermione slipped out of the Great Hall under the Invisibility Cloak while Dumbledore and Vaughn discussed the hidden American guests and their plan to let the intruders reveal themselves.
• Hermione summoned Guoguo Tea, who led the trio through secret passages and out of the castle toward the Forbidden Forest.
• Hermione used Vaughn’s Multi-Spectrum Vision Charm to give Harry and Ron infrared sight, and Guoguo Tea coordinated with an owl lookout.
• Guoguo Tea spotted Lucius Malfoy and Snape, and the trio crept toward the clearing where four heat signatures stood.

Harry, Ron, and Hermione secretly watched Lucius Malfoy and Jacob Rosier meet North American wizards in the Forbidden Forest, where Lucius revealed his loyalty to Voldemort and a battle broke out. Harry was struck by the Killing Curse’s effects and exposed, and a North American wizard ran toward the trio while they were trapped inside Hogwarts’s Anti-Apparition boundary.

• Hermione used a charm to let Harry and Ron hear Snape and Lucius Malfoy discuss their meeting and complain about Vaughn Weasley.
• More than a dozen North American wizards appeared from trees, and Robert told Lucius that the Legendary Wizard Mr. DeSantis had not come.
• Jacob Rosier said he wanted the North Americans’ help to revive someone and reunite England’s scattered Pure-blood Families, prompting Lucius to shout Voldemort’s name.
• Lucius and the North American wizards began fighting, and the trio saw Lucius summon a huge venomous serpent as spells and curses struck the clearing.
• A Killing Curse triggered Harry’s scar pain, and he tore off the Invisibility Cloak and screamed; Hermione saw a North American wizard spot them and run toward them.

Hermione used Vaughn’s Multi-Spectrum Vision Charm to predict and deflect Jason Hastings’s attack, then blinded him with a new spell. Above the forest, Dumbledore questioned Vaughn about the science behind Hermione’s magic as the battle continued below.

• Hermione used the Multi-Spectrum Vision Charm to read Jason Hastings’s magical radiation and timed Protego Deflection to send his Exploding Charm back at him.
• Jason Hastings was caught in the reflected flames and badly burned, then prepared to use Dark Arts against Hermione.
• Hermione imitated Vaughn’s wand movement and cast Lumos Caecurens, a spell that sent a light pulse through Jason’s eyes and left him blind.
• Dumbledore asked Vaughn how Hermione had learned the deflection technique, and Vaughn explained how she used the charm to judge the moment a spell arrived.
• Dumbledore questioned Vaughn about the Muggle science behind Lumos Caecurens after realizing he had not sensed Hermione cast it.

Vaughn explained how Lumos Caecurens could pass through the body and damage a target’s eyes, leaving Dumbledore fearful of its potential. After Snape dealt with Jason Hastings and the North American wizards withdrew, Harry woke and heard Ron discussing what they had witnessed.

• Vaughn explained that Lumos Caecurens used near-infrared light and the two-photon effect to blind Jason Hastings, and Dumbledore worried it could harm the brain or be developed using more dangerous light frequencies.
• Dumbledore refused to let Vaughn take Jason Hastings, saying they needed the North American wizards and the Pure-blood Families united to help Resurrect Tom.
• The dying venomous snake helped halt the battle, and Snape and Robert ended the confrontation between the Pure-blood wizards and the North American wizards.
• Snape found the blinded Jason Hastings, petrified him, and used a Magical Creature to make his disappearance look like an attack in the Forbidden Forest.
• Vaughn questioned whether Tom’s former followers could Resurrect him, and Dumbledore asked about Vaughn’s plan to gain Tom’s trust.
• Harry woke with pain near his scar and heard Ron accusing the North American wizards and Malfoy of plotting to Resurrect the Dark Lord.

Harry recovered from the Killing Curse and decided to tell Vaughn and Dumbledore what he and his friends had overheard about Voldemort’s resurrection, despite Ron’s reluctance. Meanwhile, Snape delivered the unconscious Jason Hastings to Robert’s group of North American wizards, who began examining him for signs that Snape’s explanation was false.

• Harry woke in the Gryffindor Common Room, drank Hermione’s hot cocoa, and remembered hearing Malfoy, Snape, and the North American wizards discuss resurrecting Voldemort.
• Harry, Ron, and Hermione argued over whether Snape could be trusted and whether they should report what they had heard to Vaughn and Dumbledore.
• After Hermione left, Ron admitted he had frozen in fear, and Harry decided to seek help and use Dumbledore’s Pensieve to show their memories.
• Snape brought the unconscious Jason Hastings to Robert’s group and claimed that Pygmy Puffs had bitten him and injected him with venom.
• A North American wizard questioned Snape’s story, and Robert asked Joey to examine Jason’s bite wound.

DeSantis stopped the North American wizards from retaliating after Jason Hastings was injured and interpreted Dumbledore’s actions as a sign that he wanted to resurrect Voldemort without escalating the conflict. Meanwhile, Harry tried to reach Vaughn or Dumbledore with what he had witnessed, and Ron suggested a risky way to draw them out.

• DeSantis revealed that Jason had been injured by his own Exploding Charm rebounding off a Perfect Shield Charm, then ordered the wizards to leave and told Robert to stay.
• DeSantis explained that Snape had acted on Dumbledore’s behalf, inferred that Dumbledore might support their mission to resurrect Voldemort, and warned Robert to keep away from Hogwarts and the Pure-blood Families.
• Harry went looking for Vaughn or Dumbledore but learned from McGonagall that they were at the West Tower meeting with visiting delegations and the Ministry.
• Harry realized Draco could access the West Tower but could not approach him alone because Ron stayed by his side.
• Harry and Ron met a distracted, newly groomed Hagrid, who said Vaughn had entrusted him with Beauxbatons’ Abraxans and that Vaughn and Dumbledore were occupied with the Ministry.
• Ron proposed that Hagrid fake an injury or illness among the Abraxans to provoke the Beauxbatons delegation and create a distraction, leaving Hagrid alarmed.

Harry and Ron tried to reach Vaughn and Dumbledore to warn them about a plot connected to the exchange, but Hagrid refused to help and their attempt to recruit Hermione ended in an argument. They decided to find Hagrid again with a limited warning about the Dark Lord, then remembered Guoguo Tea might help them reach Vaughn and searched for her before heading toward the Forbidden Forest.

• At the West Tower meeting, Vaughn and Dumbledore attended as Barty Crouch read the Ministry's opinions on the Potion Exchange Event, while Harry and Ron asked Hagrid for help reaching them.
• Hagrid refused to disrupt the exchange, and Harry and Ron returned to the castle after he tore his suit and hurried away to mend it.
• Harry and Ron saw Hermione arriving with Cho Zhang, then took Hermione aside to ask for help, but Ron insulted Vaughn and Hermione left angrily.
• Harry persuaded Ron to tell Hagrid only that the Dark Lord might be involved, and the two planned to speak to Vaughn and Dumbledore in person.
• Harry and Ron remembered Guoguo Tea could help them reach Vaughn, but they could not find her or Mrs. Norris and set off for the Forbidden Forest beneath the Invisibility Cloak.

Harry and Ron persuaded Hagrid to stage an Abraxan accident so they could meet Vaughn and Dumbledore, while the two men watched their plan unfold at the West Tower. Hagrid reported that the Abraxans had been injured, triggering a diplomatic commotion and leaving the gathered representatives to suspect sabotage.

• Harry and Ron used a claim that Voldemort was being revived to persuade Hagrid to help them reach Vaughn and Dumbledore.
• Harry and Ron proposed arranging a minor accident involving the Abraxans, and Hagrid agreed after they suggested blaming a wizard rather than creatures from the Forbidden Forest.
• At the West Tower meeting, Dumbledore realized Harry and Ron had convinced Hagrid, while Umbridge publicly interrupted his attempt to leave and drew attention to him and Vaughn.
• Hagrid rushed into the meeting and claimed that someone had broken into the Forbidden Forest and harmed the Abraxans.
• Dumbledore and Maxime hurried to inspect the Abraxans, while the other representatives suspected that someone was trying to sabotage the Potion Exchange Event.

Harry and Ron were caught by Umbridge after she discovered their role in the Abraxan incident, and she pressured them to help Minister Fudge. Meanwhile, Vaughn reunited with Hermione during the intermission, revealed he had been monitoring Harry and Ron, and invited her to represent Hogwarts in an exchange with the Central Alchemy Academy.

• Harry and Ron worried that Dumbledore and Vaughn would uncover their involvement in the Abraxan incident as the crowd headed to the Forbidden Forest.
• Umbridge found Harry and Ron after their Invisibility Cloak slipped off, then threatened to expose them unless they did favors for Minister Fudge.
• Vaughn brought Hermione and Guoguo Tea to the West Tower, and Hermione overheard Harry and Ron speaking with Umbridge through Vaughn's Dimension Gate magic.
• Hermione confronted Vaughn about knowing what Harry and Ron had done, and Vaughn asked her to keep an eye on them while he was busy.
• Vaughn offered Hermione the role of Hogwarts's exchange representative to the Central Alchemy Academy, and she eagerly considered it.
• Li Nanyu and Cheng Quandao followed the crowd toward the Forbidden Forest, while Cheng wondered whether they needed to join the excitement.

Harry and Ron were forced by Umbridge to spy on Dumbledore and obtain Vaughn’s research, but they planned to mislead her while searching for a way out. After Neville announced that Hogwarts would select students for the Potion Exchange Event, Harry found a new idea.

• Hagrid pretended that an Abraxan had a hoof injury, and Maxime defended him when Karkaroff criticized his alarm.
• Harry and Ron lied to Hagrid that they had met Vaughn, then argued in an empty washroom about agreeing to Umbridge’s demands.
• Umbridge had seized Harry’s Invisibility Cloak and demanded that Harry and Ron spy on Dumbledore and help Fudge obtain Vaughn’s Magic Protein and Magic Extraction Method.
• Harry proposed giving Umbridge false secrets to buy time, while Ron worried that they could not stall forever.
• Neville told Harry and Ron that Snape would hold Potions exams in three days to select Hogwarts representatives for the Potion Exchange Event.
• After Neville urged them to help Vaughn, Harry announced that he had an idea.

After the West Tower meeting, Vaughn arranged for Isabella to join the Potions selection as Snape’s assistant so Practical Class could become involved in the exchange event. He helped Hermione rest, while Harry and Ron worried about their situation and Ron hesitated over Harry’s plan.

• Dumbledore invited Vaughn for tea, but Vaughn refused and left after teasing him about his hobbies.
• Vaughn found Hermione asleep in the laboratory, shielded her with a Silencing Charm, and brought Snape shampoo while asking him to let Isa assist with the Potions selection.
• Vaughn told Isabella that he had proposed merging the exchange event with Practical Class, and she agreed it gave her a chance to develop the Painted World.
• Vaughn spoke with Guoguo Tea about Peter Pettigrew, then comforted Hermione after she woke and removed the silence field.
• Harry asked Ron whether Hermione had told Vaughn about their situation, and Ron admitted he might have a better plan but sounded uncertain.

Fleur Delacour tried to reach Vaughn Weasley but instead provoked Hermione and drew Cho Zhang into the dispute, leaving Harry and Ron jealous and embarrassed. In Dumbledore's office, Li Nanyu asked Vaughn to take Cheng Quandao under his wing during the exchange program.

• Fleur arrived at the Great Hall looking for Vaughn, while Ron became convinced she had noticed him and Harry tried to temper his hopes.
• Fleur sat beside Hermione and asked her to pass a request to Vaughn, prompting Hermione to angrily confront her with Cho Zhang's support.
• Fred and George teased Harry and Ron about being jealous of Vaughn, while Cho Zhang reflected on her wish to support Vaughn without causing trouble for her family.
• Vaughn met Li Nanyu and Cheng Quandao in Dumbledore's office, where Dumbledore joked with them over tea and listened as Li proposed a deal.
• Li asked Vaughn to let Cheng study at his side during the exchange program so the restless student might mature.

Vaughn recruited Cheng Quandao as an assistant and tested Wolfsbane Potion Version 2.1 on Remus Lupin. The trial shortened Lupin’s suffering and prevented his transformation, but Vaughn concluded the potion still needed refinement.

• Li Nanyu arranged for Cheng Quandao to teach Vaughn Eastern magic, and Cheng joined Vaughn as his assistant despite Dumbledore’s objections.
• Vaughn showed Cheng how he made Wolfsbane Potion Version 2.1 using Magic Protein and invited him to observe a clinical trial.
• Vaughn led Cheng to the Shrieking Shack, where Hermione and Lupin were waiting, then brought them into the magical testing space containing a Magic Moon.
• Lupin took the new potion and endured intense reactions for about ten minutes, but he did not transform into a wolf.
• Vaughn assessed the results and decided that Wolfsbane weakened the molecular chaperone’s protective effect, so the potion needed another medium.

Vaughn continued the Wolfsbane Potion trials and discussed his political strategy with Amelia, while Hogwarts prepared for the selection exams. Harry and Ron planned to embarrass themselves to avoid Vaughn and Dumbledore, but their exam began with Snape assigning the fourth-years Polyjuice Potion.

• Vaughn gave Lupin a Draught of Joy and suggested he rest before representing WAC in talks with the Auror Office, prompting Lupin to try to hand the work to Montague.
• Hermione warned Cheng Quandao that Vaughn's experiments were dangerous and advised him to learn the Clairvoyance Charm.
• Vaughn explained to Amelia that keeping her apart from the Potion Exchange Event was meant to protect her politically, then used a Strange Sphere to prevent eavesdropping.
• Harry and Ron agreed to embarrass themselves in the selection exam so they would not have to get near Vaughn and Dumbledore.
• Professor Rosier welcomed Snape as chief examiner, and Snape announced that the fourth-years' exam topic was Polyjuice Potion.

Vaughn negotiated with Dumbledore over launching the Werewolf Class and expanding the Triwizard Tournament into an Eightwizard, while Snape tested students on Vaughn’s Transfiguration Potion. Hermione brewed the potion, Neville passed, and Harry and Ron appeared to be plotting something.

• Snape gave the students an exam on brewing Vaughn’s Transfiguration Potion, and Harry explained its connection to the Potion Exchange.
• Ron realized that Snape’s exam questions all related to Vaughn and suggested that he and Harry do something about the waiting students.
• Vaughn urged Dumbledore to implement the Werewolf Class before term ended and refused to share a candidate without better bargaining chips.
• Vaughn proposed expanding the Triwizard Tournament into an Eightwizard, and Dumbledore said he needed time to consider it.
• Hermione brewed the Transfiguration Potion and watched Harry and Ron, while Neville drank his potion and passed after his nose grew three feet long.

Harry and Ron’s Transfiguration Potion misfires turned them into girls, while Hermione deliberately failed the assessment by letting her hair grow out of control. After Harry and Ron decided to ask Hermione why she gave up her chance at the potion exchange, Fleur followed Cheng Quandao into Vaughn’s laboratory despite his warning.

• Dean, Seamus, Crabbe, and Goyle suffered strange potion effects, and Harry and Ron drank their own doses in front of the class.
• Harry and Ron transformed into girls, drawing laughter from their classmates before they fled the classroom.
• Hermione let the potion make her hair grow, accepted Snape’s failing grade, and used an antidote to stop the effect.
• Harry and Ron suspected Hermione had failed on purpose and asked Lavender Brown to tell her they were waiting in the Common Room.
• Cheng Quandao warned Fleur to wait outside Vaughn’s laboratory, but Fleur pushed past him and entered.