Albus Enters Slytherin and Finds Scorpius Amid Rumors and Expectations Nineteen years after the Battle of Hogwarts, Harry and Ginny send their children off at King’s Cross alongside Ron, Hermione, and the Malfoys. Albus befriends Scorpius on the train and is sorted into Slytherin, while whispers claim Scorpius is Voldemort’s son. Struggling at school, Albus fails spells and flying, earns the cruel “Squib” nickname, and feels crushed by his father’s legend. Only Scorpius stands by him.
The Golden Trio’s Adult Lives Reshape the Ministry and the Weasley Business Hermione becomes Minister for Magic, Harry leads the Auror Office, and Ron joins George running Weasleys’ Wizard Wheezes. Harry’s lax paperwork exasperates Hermione, echoing old habits. Despite success, Harry worries over McGonagall’s reports of Albus’s troubles.
A Fractured Father–Son Bond and a Plan to Save Cedric Years pass and Albus rejects Hogwarts traditions, even burning his Hogsmeade permission slip, while Scorpius mourns his mother Astoria. Amos Diggory begs Harry to use a Time-Turner to save Cedric, and Albus meets Delphi, Amos’s carer. A tense gift of Harry’s baby blanket triggers a fierce argument in which father and son wish each other away. On the train, Rose’s half-hearted outreach fails, and Albus resolves to help Amos by stealing the Time-Turner with Scorpius and Delphi.
A Polyjuice Heist and a First Time Jump that Warps the Present Albus and Scorpius evade the century-old Trolley Witch, join Delphi via St. Oswald’s, brew Polyjuice, and infiltrate the Ministry disguised as Ron, Harry, and Hermione. They seize a short-range prototype Time-Turner and sabotage Cedric during the First Task. Snapped back to the altered present, they find Albus in Gryffindor, Rose erased, and Hermione a Defense professor while Ron married Padma. Pressured by Harry to abandon Scorpius, Albus chooses his father.
Second Attempt, Darker Timeline: Cedric Lives, Voldemort Wins Reunited through Delphi, the boys try again at the lake, humiliating Cedric to lower his score. The fix breaks reality: Cedric survives, becomes a Death Eater, kills Neville, and Voldemort wins, erasing Albus from existence. In this timeline, Scorpius finds Snape, Ron, and Hermione leading the resistance and uses their help to restore the original present. They resolve to end the risk by destroying the Time-Turner.
Delphi Unmasked as Voldemort’s Heir and the Leap to 1981 Scorpius notices Delphi’s Augurey tattoo and links her to Euphemia Rowle, exposing deeper Death Eater ties. Delphi shatters their trust and their wands, murders Craig Bowker Jr., and forces another use of the Time-Turner at the Third Task. Wrenching the device, she leaps to October 30, 1981, and destroys it, stranding the boys in the past. They deduce her aim is to warn Voldemort at Godric’s Hollow so he never falls.
A Message on a Blanket, a Trap in Godric’s Hollow, and Delphi’s Defeat In Godric’s Hollow, Albus and Scorpius mix stolen potion to write a hidden message on Harry’s baby blanket: Dad, help, Godric’s Hollow, 31/10/81. Harry recognizes the signal, gathers Hermione, Ron, Ginny, and Draco, and arrives with an improved Time-Turner. Transfigured as Voldemort, Harry draws Delphi out; she reveals herself as Bellatrix and Voldemort’s daughter, primed by Rodolphus and prophecy. United, they subdue her, and Harry remains to witness his parents’ deaths to keep history intact.
Aftermath: Reconciliation, Azkaban, and Choosing the Present Delphi is imprisoned in Azkaban and begs for execution, which Harry refuses. Harry and Albus reconcile and visit Cedric’s grave, finding peace. Scorpius asks Rose out; she declines gently, kisses his cheek, and jokingly calls him “Scorpion King,” a relic from a vanished timeline. The boys accept the present and let the past stand.