"Harry Potter and the Philosopher's Stone" is the first book in the Harry Potter series by J.K. Rowling. It follows the story of an orphaned boy named Harry Potter who discovers he is a wizard on his eleventh birthday. He attends Hogwarts School of Witchcraft and Wizardry, where he learns about magic, makes friends like Ron Weasley and Hermione Granger, and uncovers the truth about his parents' death. Throughout the school year, Harry faces challenges, including encounters with the dark wizard Lord Voldemort. He learns about the Philosopher's Stone, a magical object that grants immortality. The story explores themes of friendship, bravery, and the battle between good and evil.