When a Letter Arrives for Unhappy but Ordinary Harry Potter, a Decade-Old Secret is Revealed to Him That Apparently He's the Last to Know. His Parents Were Wizards, Killed by a Dark Lord's Curse When Harry Was Just a Baby, and Which He Somehow Survived. Escaping His Hideous Muggle Guardians for Hogwarts, a Wizarding School Brimming With Ghosts and Enchantments, Harry Stumbles Upon a Sinister Adventure When He Finds a Three-Headed Dog Guarding a Room on the Third Floor. Then He Hears of a Missing Stone With Astonishing Powers Which Could Be Valuable, Dangerous, or Both.