Chapter Summaries

Ron searched Hogwarts all day for Scabbers and grew convinced that outsiders or Vaughn had taken him, while Harry tried to calm him. At the welcoming feast, Harry and Ron saw the transformed Great Hall, and Draco covertly alerted Harry to Lucius Malfoy and two unfamiliar pure-blood guests seated at the staff tables.

• Ron woke Harry and the other boys to report that Scabbers had vanished, then accused the visiting foreigners of taking him.
• Hermione dismissed Ron’s theory, explaining that McGonagall had awakened the castle statues to guard its entrances and that Fred and George had been caught wandering at night.
• Professor Sprout and Hagrid explained that Dumbledore had asked them to bring flowers for the Great Hall, and Hagrid suggested asking Vaughn’s cat to help find Scabbers.
• Harry, Ron, and their friends searched the castle without success, while Ron increasingly suspected the foreigners, Vaughn, and other Gryffindors.
• Harry and Ron entered the lavishly decorated Great Hall, where Draco mocked them and claimed his father and two pure-blood families had lent the decorations.
• Draco signaled Harry to notice Lucius Malfoy and two strangers at the staff seating, and one of the unfamiliar wizards turned to stare at Harry.

Jacob Rosier and Lucius Malfoy discussed Severus Snape and the 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 out Tom, and the chapter ended with Vaughn refusing to reveal his own Death Eater contact without a better offer.

• Jacob Rosier asked Lucius Malfoy whether Harry Potter seemed abnormal, and Lucius dismissed Harry as an average troublemaker tainted by his mother’s blood.
• A hidden portrait relayed Lucius and Jacob’s conversation to Dumbledore and Vaughn, while Phineas Black and the other portraits argued.
• Dumbledore and Vaughn agreed that Lucius and Jacob would meet the North American guests that night, while Dumbledore planned to use Snape to help bring Tom back into the open.
• Vaughn described how Dumbledore had used Snape’s loyalties and connections, and Dumbledore asked whether Vaughn thought him cruel.
• Dumbledore asked Vaughn to identify the Death Eater he had mentioned in their earlier intelligence deal, but Vaughn said the offer still was not enough.

Harry watched the international Wizarding Schools Potions exchange delegations arrive at Hogwarts and learned why several schools were interested in Vaughn’s potion research. The chapter ended with Cheng Quandao joining Harry and Ron at the Gryffindor table and insulting Ron while complaining about the food.

• Harry worried about Lucius Malfoy’s purpose at Hogwarts and watched the staff table, while Neville mistook his glances for concern about his face.
• Dumbledore and Vaughn entered the Great Hall with the professors and delegations, and Dumbledore introduced the visiting schools.
• Hermione explained that Castelobruxo wanted Vaughn’s potion-making methods to develop South America’s magical resources, and its leaders gathered around him.
• Nanyu Li arrived with the Central Academy of Qi Refining delegation and received the respect of the other school leaders and students.
• Cheng Quandao sat between Harry and Ron, told Ron he lacked the mettle to become a legend, and asked Harry whether the banquet had French food.

At Hogwarts’ welcome feast, Cheng Quandao provoked Ron while Vaughn and Lucius Malfoy clashed over the International Statute of Secrecy. Uneasy about Lucius leaving with Jacob Rosier and Snape, Harry persuaded Ron and Hermione to follow them, despite McGonagall’s order to remain in the Great Hall.

• Cheng Quandao criticized the English food and deliberately provoked Ron, while Hermione concluded that Ron was being used to get at Harry.
• Vaughn discussed the International Statute of Secrecy with Li Nanyu, and Lucius Malfoy accused him of plotting to destroy it.
• Jacob Rosier escorted Lucius out of the Great Hall, and Dumbledore sent Snape with them.
• Harry noticed Draco watching the side door anxiously and told Ron and Hermione that Lucius’s group might be plotting something.
• Harry, Ron, and Hermione decided to follow Lucius’s group quietly, even though McGonagall had ordered students to stay in the Great Hall.

Harry, Ron, and Hermione slipped out of the Great Hall under the Invisibility Cloak and followed Fruit Tea through Hogwarts’s secret passages into the Forbidden Forest. Using Hermione’s infrared vision charm, they spotted Lucius Malfoy, Snape, and two others in a clearing, about a hundred feet away.

• Harry, Ron, and Hermione left the Great Hall beneath the Invisibility Cloak while Dumbledore and Vaughn discussed the hidden visitors and their plan to wait for them to reveal themselves.
• Hermione summoned Fruit Tea, who led the trio through secret passages and out of the castle near the Black Lake.
• Hermione used Vaughn’s Multispectral Vision Charm to give Harry and Ron infrared vision, and Fruit Tea coordinated with an owl scout.
• Fruit Tea led the trio deeper into the Forbidden Forest and climbed a tree to scout ahead.
• Harry, Ron, and Hermione crept over a rise and saw four human heat signatures in a clearing, including Lucius Malfoy and Snape.

Harry, Ron, and Hermione secretly watched Lucius Malfoy and Jacob Rosier meet North American wizards in the Forbidden Forest to discuss resurrecting Voldemort. When a battle broke out, Harry’s scar reacted to a Killing Curse, exposing the trio and drawing a wizard toward them.

• Hermione enchanted the trio’s ears so they could hear Snape, Lucius Malfoy, and Jacob Rosier waiting for their visitors.
• More than a dozen North American wizards emerged from the trees, and Robert told Lucius that the Legendary Wizard DeSantis would not attend.
• Jacob said he wanted to enlist the visitors’ help to resurrect their master, and Lucius shouted Voldemort’s name when Robert insulted him.
• Lucius’s magic erupted into a battle featuring a giant black serpent, while Jacob struck a North American wizard with the Cruciatus Curse.
• A green flash triggered Harry’s scar pain, and Hermione saw a North American wizard run toward the exposed trio.

Hermione used Vaughn’s Multispectral Vision Charm to predict an enemy spell and reflect it back at Jason Hastings, then blinded him with a science-based spell. Dumbledore watched from above and questioned Vaughn about the dangerous new magic as Hermione continued fighting below.

• Hermione used the Multispectral Vision Charm to anticipate Jason Hastings’s Exploding Charm and reflect it into him with a Perfect Shield Charm.
• Dumbledore and Vaughn watched from a flying carpet as Hermione’s reflection injured Jason, and Dumbledore asked Vaughn to train Harry in the technique.
• When Jason raised his wand with green light, Hermione imitated Vaughn’s movement and cast Lumocecuren, blinding Jason with an invisible pulse.
• Dumbledore asked Vaughn how Lumocecuren worked and was unsettled by how little he had sensed when Hermione cast it.

Vaughn explained that Lumocecuren used near-infrared light to blind its target, alarming Dumbledore with the spell’s undetectable and potentially dangerous nature. After Snape silenced Jason Hastings and disguised his injuries as a Swooping Evil attack, Harry woke and overheard Ron and Hermione arguing about what they had witnessed.

• Vaughn explained Lumocecuren’s two-photon effect and how it had destroyed Jason Hastings’s vision, while Dumbledore feared what other light-based spells might do.
• Dumbledore refused to hand Jason over to Vaughn, and Vaughn warned that Jason must not reveal that he had seen Harry, Ron, and Hermione.
• Snape petrified Jason, then used a Swooping Evil to support a false story that the creature had attacked him and damaged his memory.
• Vaughn doubted that Voldemort would trust his former followers enough to accept their resurrection plan, and Dumbledore asked about Vaughn’s own plan.
• Harry woke and heard Ron and Hermione arguing about the North American wizards, the pure-blood meeting, and the plot to resurrect Voldemort.

Harry, Ron, and Hermione argued over whether to report the plot to resurrect Voldemort after overhearing Snape and the North American wizards, and Harry decided to seek help from Vaughn and Dumbledore. Meanwhile, Snape delivered the unconscious Jason Hastings to Robert’s group, who began checking whether his story about a Swooping Evil was true.

• Harry woke after collapsing and recalled hearing Lucius Malfoy, Snape, and North American wizards discuss resurrecting someone who was hiding his identity.
• Ron and Hermione argued over whether to trust Snape and tell Vaughn and Dumbledore what they had heard.
• Harry decided to report the plot and use Dumbledore’s Pensieve to provide their memories as evidence.
• Ron admitted he had been scared during the encounter, while Harry blamed his scar’s reaction to the Killing Curse for exposing them.
• Snape brought the unconscious Jason Hastings to Robert’s group and said a Swooping Evil had bitten him.
• Robert sent Joey to examine Jason, and she found a bite wound on his neck.

DeSantis stopped the North American wizards from retaliating after Jason Hastings was injured, explaining that Dumbledore and Severus Snape had signaled they did not want the conflict to escalate. Meanwhile, Harry struggled to deliver what he had witnessed to Dumbledore or Vaughn, and Ron proposed provoking a disturbance involving Hagrid’s Abraxans to draw them out.

• DeSantis revealed that Jason Hastings had been injured by his own reflected Exploding Charm and ordered the North American wizards to leave Hogwarts and avoid escalating tensions with the pure-blood families.
• DeSantis told Robert that Dumbledore knew of their movements and likely wanted to help resurrect Voldemort, while warning him to keep their operations away from Hogwarts Castle.
• Harry failed to find Vaughn or Dumbledore because they were meeting visiting delegations at the West Tower, and McGonagall warned him not to approach the crowded area.
• Harry learned that Snape was also at the West Tower, then considered asking Draco Malfoy to pass along a message but could not get him alone.
• Harry and Ron encountered Hagrid, who said Vaughn had assigned him to care for the Beauxbatons Abraxans and that Vaughn and Dumbledore were occupied with Ministry officials.
• Ron suggested that Hagrid give an Abraxan a minor injury or illness to create a disturbance and draw Vaughn or Dumbledore out, leaving Hagrid alarmed by the plan.

Harry and Ron struggled to warn Vaughn and Dumbledore about a plot involving Voldemort, but their attempts to reach them failed. After they argued with Hermione, they remembered Fruit Tea might help them contact Vaughn, but she and Mrs. Norris were missing, so they headed for the Forbidden Forest under the Invisibility Cloak.

• At the West Tower, Vaughn and Dumbledore attended the Potions Exchange reception while Harry and Ron tried unsuccessfully to persuade Hagrid to help them reach the meeting.
• Harry and Ron saw Hermione arrive at lunch with Cho Chang, then argued with Hermione after asking her for help contacting Vaughn.
• Harry and Ron decided to tell Hagrid that someone was plotting to bring Voldemort back, while keeping the rest of what they knew secret.
• Harry and Ron remembered that Fruit Tea could help them reach Vaughn, but they could not find her or Mrs. Norris anywhere in the castle.
• Harry and Ron left under the Invisibility Cloak and headed toward the Forbidden Forest.

Harry and Ron persuaded Hagrid to stage an incident involving the Abraxans so they could get Vaughn and Dumbledore’s attention, claiming they needed the Pensieve to prove a plot to revive Voldemort. Their plan unfolded at the West Tower, where Hagrid reported that someone had injured the Abraxans, leaving the visiting delegations suspicious of sabotage.

• Harry and Ron visited Hagrid and claimed that someone among the visiting delegations was working with Voldemort, asking him to help them reach Vaughn or Dumbledore.
• Harry and Ron proposed that a wizard cause a minor accident involving the Abraxans, and Hagrid agreed to help after rejecting the idea of using dangerous creatures.
• Harry and Ron went to the West Tower while Vaughn and Dumbledore watched them from the meeting, and Dumbledore tried to leave Vaughn to handle what followed.
• Umbridge approached Dumbledore and Vaughn, loudly invoking Minister Fudge as she offered suggestions to the school representatives.
• Hagrid rushed into the meeting and announced that someone had entered the Forbidden Forest and injured the Abraxans, prompting Dumbledore and the Beauxbatons delegation to investigate.
• The representatives suspected the Abraxan incident was deliberate sabotage, especially because Ministry officials and pure-bloods had arrived shortly before it happened.

Harry and Ron were caught by Umbridge after she discovered their role in the Abraxan incident and agreed to hear what she wanted in exchange for her silence. During the meeting break, Vaughn and Hermione listened in, discussed the incident, and considered Hermione serving as Hogwarts' liaison to the Central Refining Academy.

• Harry and Ron worried Hagrid might face trouble over the Abraxans, then headed to the West Tower to find Vaughn.
• Umbridge caught Harry and Ron after their Invisibility Cloak slipped off and threatened to expose their actions unless they helped Minister Fudge.
• Vaughn brought Hermione and Fruit Tea to the West Tower and used spatial magic to let Hermione hear Harry, Ron, and Umbridge's conversation.
• Hermione was angered by Harry and Ron's actions, and Vaughn asked her to keep an eye on them while he was busy.
• Vaughn suggested Hermione serve as Hogwarts' liaison to the Central Refining Academy, and she eagerly considered the role.
• Li Nanyu and Cheng Quandao went to the Forbidden Forest, where Li Nanyu said they were going with the flow.

Harry and Ron hid the truth about the Abraxan and argued over Umbridge’s threats, then learned Hogwarts would hold a potions exam for the Potions Exchange. Harry ended the chapter with a new idea for dealing with Umbridge and helping Vaughn.

• Madame Maxime defended Hagrid after he pointed out a small cut on an Abraxan’s hoof, while Karkaroff complained about the interruption.
• Harry and Ron falsely told Hagrid they had seen Vaughn, then returned to the castle and argued over agreeing to Umbridge’s demands.
• Harry explained that they could give Umbridge false secrets about Dumbledore to buy time, though neither boy knew how to avoid her threats for long.
• Neville told Harry and Ron that Hogwarts would select student representatives for the Potions Exchange through an exam in three days.
• Harry announced that he had an idea after Neville urged him and Ron to help Vaughn.

After the West Tower meeting, Vaughn arranged for Isabella to assist Snape with the Potions Selection and encouraged her to develop the Practical Class through the exchange. The chapter ended with Hermione awake again and Harry and Ron quietly disagreeing about how to avoid Vaughn and Dumbledore.

• Dumbledore invited Vaughn for tea, but Vaughn declined and left through a strange spherical portal, prompting Dumbledore to wonder about his knowledge of China.
• Vaughn found Hermione asleep in the Laboratory, cast a magical silence field to protect her rest, and took shampoo to Snape while asking him to include Isa as his assistant in the Potions Selection.
• Vaughn told Isabella that the exchange would give her a legitimate role in developing the Practical Class, and she welcomed the opportunity despite worrying that the school governors might intervene.
• Vaughn spoke with Fruit Tea about watching Peter Pettigrew and letting Harry and Ron manage on their own, then lifted the silence field when Hermione woke.
• Harry asked Ron whether Hermione had told Vaughn what happened, and Ron hesitated over Harry's proposal for avoiding Vaughn and Dumbledore.

Fleur tried to approach Vaughn but instead provoked Hermione, while Harry and Ron misread the tensions and became the target of Fred and George’s teasing. Later, Li Nanyu asked Vaughn to take Cheng Quandao under his wing during the exchange programme, and Vaughn agreed to hear the proposal.

• Fleur entered the Great Hall looking for Vaughn, sat beside Hermione, and asked her to pass a request to him in the name of friendship between Beauxbatons and Hogwarts.
• Harry and Ron watched Fleur speak with Hermione and Cho Chang, then Fred and George teased them for being jealous of Vaughn.
• Hermione left the Great Hall upset, while Cho Chang reflected on her wish to support Vaughn and her decision to befriend Hermione.
• Vaughn met Li Nanyu and Cheng Quandao in Dumbledore’s office, where Li asked him to let Quandao stay with him and learn during the exchange.
• Vaughn agreed to hear Li’s proposal as Dumbledore recognized the familiar problem of dealing with a troublesome student.

Vaughn accepted Cheng Quandao as an assistant in exchange for learning Eastern magic, then tested Wolfsbane Potion version 2.1 on Remus Lupin. The trial reduced Lupin’s suffering and prevented his transformation, but Vaughn concluded that the potion still needed refinement.

• Li Nanyu arranged for Cheng Quandao to assist Vaughn and teach him Eastern magic, while telling Dumbledore he had grown old.
• Vaughn showed Cheng Quandao how he extracted ingredients with the Essence Charm and revealed Wolfsbane Potion version 2.1.
• Cheng Quandao told Vaughn about rumors that three girls had fought over him, then followed him through the Whomping Willow passage to the Shrieking Shack.
• Vaughn introduced Cheng Quandao to Hermione Granger and Remus Lupin, then brought them into the suitcase world for a clinical trial beneath the Magical Moon.
• Lupin took the potion and suffered severe but brief symptoms without transforming, prompting Vaughn to consider adding another medium.

Vaughn warned Amelia that the Potions Exchange was only the start of a larger plan, then the Hogwarts selection exam began with Harry and Ron hoping to fail deliberately. The chapter ended as Snape announced that the students would be tested on Polyjuice Potion.

• Lupin endured the final stages of Wolfsbane Potion trials, then Vaughn sent him to rest and suggested Mundungus could represent c in talks with the Auror Office.
• Hermione warned Cheng Quandao that Vaughn’s experiments were dangerous and advised him to learn the Spectral Vision Charm before visiting the Laboratory.
• Vaughn told Amelia Bones that the Potions Exchange was only the beginning and used magic to prevent a certain old man from eavesdropping on their meeting.
• Harry and Ron agreed to make fools of themselves in the selection exam so they could avoid Vaughn and Dumbledore for a while.
• Isabella Rosier introduced Snape as chief examiner, and Snape announced that the year group’s exam was on Polyjuice Potion.

Snape tested Hogwarts students on Vaughn’s unfinished Transformative Potion, while Vaughn pressed Dumbledore to establish the Werewolf Class and negotiate an expanded Triwizard Tournament. Neville passed the potion test with a three-foot nose, and Hermione suspected Harry and Ron were deliberately mishandling their brews.

• Snape set the students a Transformative Potion challenge and required them to lengthen their noses by more than two feet to pass.
• Harry explained the potion’s connection to Vaughn’s research, and Ron realized the selection questions centered on Vaughn’s work.
• Vaughn urged Dumbledore to establish the Werewolf Class and proposed expanding the Triwizard Tournament from three participants to eight.
• Hermione brewed the potion successfully but waited to see what Harry and Ron would do.
• Neville drank his potion, grew a three-foot nose, and earned Snape’s approval.
• Ron appeared to hope Neville would knock over his cauldron, while Hermione watched the boys with suspicion.

Harry and Ron failed the Transformative Potion assessment and became girls, while Hermione deliberately failed and used an antidote to reverse her transformation. As Harry and Ron tried to learn why, Pheobe pushed into Vaughn’s Laboratory despite Cheng Quandao’s warning.

• Dean Thomas, Seamus Finnigan, Crabbe, and Goyle suffered bizarre transformations after their potion spells went wrong.
• Harry and Ron drank their potions and transformed into girls, prompting Snape to call them Miss Potter and Mrs. Weasley.
• Hermione deliberately let her hair grow, failed the assessment, then brewed and drank an antidote before leaving for the Gryffindor Common Room.
• Harry and Ron suspected Hermione had failed on purpose and asked Lavender Brown to tell her they were waiting for her.
• Cheng Quandao warned Pheobe that Vaughn might throw her out of the Laboratory, but she pushed past him and opened its door.