Harry Potter is now twelve years' old. 

When he dreams of going back to Hogwarts School of Witchcraft and Wizardry, he hears talk at the Leaky Cauldron tavern and Inn, that the Dark Lord Voldemort, grows strong, while Death Eaters, the followers of the dark wizard, attempt to get rid of him.

The second Harry Potter fantasy novel, and the sequel to The Leaky Cauldron.