When a letter arrives for unhappy but ordinary Harry Potter, a decade-old secret is revealed to him. His parents were wizards, killed by a Dark Lord´s curse when Harry was just a baby, and which he somehow survived. Escaping from his unbearable Muggle guardians to Howwarts, a wizarding school brimming with ghosts and enchantments, Harry stumbles into a sinester adventure when he finds a threeheaded dog guarding a room on the third floor. Then he hears of a missing stone with astoninshing powers which could be valuable, dangerous, or both.