, Harry Potter and the Sorcerer’s Stone (written by J.K. Rowling) The plot of the story begins when Harry learns that Professor Snape is after the Sorcerer’s Stone. The Professor lets loose a troll, who nearly kills Harry and his friends. In addition, Harry finds out that Hagrid let out the secret of the giant dog to a stranger in return for a dragon which means that Snape can now reach the Sorcerer’s Stone.