This book is about the next generation of witches and wizards. Hermione and Ron are married and Harry and Ginny are married and have kids. Hermione and Ron have Rose Granger-Weasley and Hugo Granger-Weasley while Harry and Ginny have James Potter, Albus Potter and Lily Potter. On Albus's first day of school at Hogwarts, James taunts him about the fact that he might be in Slytherin. Albus tells his dad (Harry) and Harry tells him that there's nothing wrong with being in Slytherin (which there isn't) and that it's okay. Aboard the Hogwarts Express, Albus befriends Scorpius Malfoy (Draco Malfoy's son) while Rose stays well away. SPOILER ALERT!!: The Sorting Hat declares that Albus is a Slytherin! He has to dodge rude comments and nastypeople who tease him just because he's in that house instead of Gryffindor. In their fourth year, Albus meets a young woman who, apparantly, is called Delpini Diggory or Delphi for short. SPOILER ALERT!!: Delphi is actually Lord Voldemort's daughter and plans to use Hermione's time-turner to get him back!! (But that's just cos she wants to see her dad one last time though.)The boys decide to help Delphi because she says that she is just trying to revive Cedric and says that he is her cousin. Will the boys stop Delphi before the world is ruled by the Dark Lord again?! Or will all be lost?! Find out in this book full of magic and mischief!
Side-note: In 1998, Bellatrix Lestrange used a Amortencia (a love potion) on Voldemort and they had Delphi while he was in love with her. That's how blue and silver-haired Delphi was born.
P.S. Sorry, I know I'm a massive Potterhead!!!