Imagine being stranded in the dead of night, only to be whisked away by a triple-decker purple bus that appears out of nowhere. For Harry Potter, this unexpected journey on the Knight Bus signals the start of another extraordinary year at Hogwarts School of Witchcraft and Wizardry.

But darkness is creeping ever closer. Sirius Black, an escaped mass-murderer and alleged follower of Lord Voldemort, is on the loose—and whispers say he's coming for Harry. During his first Divination class, Professor Trelawney foresees an omen of death in Harry's tea leaves, casting an even darker shadow over his third year.

And then there are the Dementors—grim, soul-sucking creatures patrolling the school grounds, threatening to drain every drop of happiness from those they encounter. With danger lurking at every corner, Harry must confront fears he never knew he had. Will he uncover the truth behind Sirius Black's escape? Or will the darkness swallow him whole?