Recaps

Douglas destroyed Tom Riddle’s diary, then helped the professors investigate the threat around the Chamber of Secrets while Hogwarts continued through exams and Christmas. The arc ended with Douglas teaching the fifth-years to face Boggarts, as Hermione fled after hers took Douglas’s form.

• Douglas received Riddle’s diary from Luna Lovegood, learned that it had offered him power and urged him to release the basilisk, then destroyed it with lightning and brought the remains to Dumbledore.
• Dumbledore explained that Tom Riddle had been his student and might have split his soul, while Douglas inferred that Voldemort had controlled Tom Cruise to investigate Riddle.
• When the professors could not enter Douglas’s office, Harry, Hermione, and Ron warned him, and Douglas passed Snape’s test, then reprimanded the students for investigating him and assigned self-criticisms.
• Douglas coached Hermione in the Stunning Spell, watched Harry win the Quidditch match despite a Bludger targeting him, and helped Harry question Dobby about the danger at Hogwarts.
• Douglas created a Snow Monster for students to defeat, and they brought it down with water and mud before two students won its rune-inscribed plaques.
• Douglas joined the professors for hot pot, oversaw end-of-term exams, held a book event where he exposed Rita Skeeter’s Animagus secret, and celebrated Christmas with friends and the Weasleys.
• Douglas taught the fifth-years the Riddikulus spell and tested them against Boggarts, and Neville and Seamus succeeded, Ron panicked at a spider, and Hermione ran out when her Boggart impersonated Douglas.

Douglas helped Harry understand his connection to Voldemort and uncovered the truth about the Chamber of Secrets, clearing Hagrid’s name and freeing Dobby. With the basilisk taken away and the Chamber left open, Douglas proposed turning it into a practical training ground.

• Douglas removed his curse after reaching 10,000 points, then helped Harry learn that his Parseltongue came from Voldemort and did not define who he was.
• Douglas and Dumbledore kept Harry’s ability secret, while Harry, Ron, and Hermione debated entering the Chamber and Douglas urged them to focus on their studies and training.
• Harry and Ron tried to reach Moaning Myrtle’s Bathroom, but Douglas caught them, took the Invisibility Cloak, and assigned them self-reflections after deducting Gryffindor points.
• Douglas obtained Voldemort’s Diary and used it to free Dobby, then offered the house-elf a paid butler position that Dobby accepted.
• Douglas presented Myrtle’s account and the lack of injuries as evidence that a basilisk had killed her, and Fudge cleared Hagrid while Douglas identified Tom Marvolo Riddle as Voldemort.
• Snape led the group into the Chamber with protections against the basilisk, while Douglas confronted Lucius Malfoy about the Diary and the piece of Voldemort’s soul inside it.
• Dumbledore brought the captured basilisk out of the Chamber, Newt prepared to take it, and Scrimgeour’s offer of an Auror position was declined by Douglas.
• After the Chamber’s entrance would not close, Douglas proposed replacing its entrance magic and converting the Chamber into a practical training ground.

Douglas brought Harry into his home, reunited Sirius with his godson, and began investigating the histories of Voldemort and the Gaunt family with Dumbledore. The arc ended as Harry returned to Hogwarts, tasked with organizing students from all four Houses to investigate Sirius’s case.

• Dumbledore revealed Douglas’s distant family connection to Harry and asked him to look after Harry, while Douglas welcomed Hermione and her parents to his home.
• Douglas learned of Sirius Black’s escape, sent Dobby to watch Harry, and later recognized Sirius in his Animagus form and restrained him before he could pursue Peter Pettigrew.
• Douglas explained to Sirius how he had identified Peter and urged him to clear his name and protect Harry, while Sirius agreed to wait and plan rather than rush into revenge.
• Dumbledore visited Douglas, and they agreed that Remus Lupin would supervise the Magic Practice Study Room as Douglas returned to teaching at Hogwarts.
• Douglas and Dumbledore searched the Gaunt Shack, broke into a hidden chamber, and recovered a dangerous object that Dumbledore placed in Douglas’s Anti-Magic Stone Box.
• Douglas questioned Morfin Gaunt’s conviction and suspected Voldemort had framed him, then left taunting messages at the Riddle House and the Riddle family grave.
• Douglas told Harry that Sirius was his godfather and challenged him to bring students from all four Houses together to investigate the case, then signed Harry’s Hogsmeade permission form.
• On the Hogwarts Express, Harry told Ron and Hermione about Douglas’s investigation assignment, and they found Professor Lupin asleep in a compartment.

Douglas Holmes protected Harry from the Dementors, shaped Hogwarts’ routines, and helped Hagrid after Buckbeak injured Draco. As Harry launched a detective agency, Douglas brought Lupin and McGonagall into the truth about Sirius and Pettigrew, and they agreed to keep their plan secret while working to clear Sirius’s name.

• Harry’s Wooden Plaque trapped a Dementor on the Hogwarts Express, and Douglas later told Dumbledore he would keep it from the Ministry.
• Douglas welcomed students back as Defense Against the Dark Arts professor, introduced morning runs with Lupin, and set new rules for classes and detentions.
• Douglas investigated George and Fred’s fake exam answers and arranged copying punishments, while also intervening after Buckbeak injured Draco in Hagrid’s lesson.
• Douglas helped Hagrid improve student safety and urged Harry to investigate Sirius with help from the professors.
• Douglas persuaded Draco to forgive Hagrid and Little Grey, and Draco agreed to ask his father not to pursue the matter.
• Douglas revealed Padfoot’s identity to Lupin, who realized that Scabbers was likely Pettigrew and reconciled with Sirius.
• McGonagall confronted Sirius in Douglas’s office, learned how Pettigrew had betrayed the Potters, and then brought Dumbledore into the discussion.
• Douglas, McGonagall, and the others agreed to keep Pettigrew’s survival secret, watch him, and focus on clearing Sirius’s name as Harry, Ron, and Hermione organized the Charon Detective Agency.