The book tells us about Harry Heller, a different boy, with "Wolf nature" as the Steppenwolf treatise says; this gift was received by Harry from an unknown person. It all begins when Harry Haller arrives at a room he had rented. Harry leaves the room, takes a walk and discovers some announcements that he considers interesting, for example the entrance to the magic theater, with the legend not for everyone. Back in his room, he crosses a street and sees a boy carrying an advertisement for the same theater and a stage that Harry wants to buy; the boy gives him a brochure and leaves. The title of the booklet could read: Steppe Wolf Treat. Not for everyone. The sheet tells the story of the steppe wolf: once a steppe wolf was called Harry but he was called a steppe wolf, he walked on two legs but inside he was a real steppe wolf. By chance he arrives at the Black Eagle restaurant, and after leaving a teachers' lounge because he didn't like a photograph, Harry sees a girl who seems interesting to him so, he approaches her and they start talking, he tells her about his success at professor's house and explains that he won't be able to get to his house because something terrible is waiting for him in there, the suicidal Armanda talks to Harry about the gratitude she feels towards him for having recovered him from the dead. According to Armanda, Harry will follow any orders she gives him, and she ends by saying that she will make him fall in love with her and then kill her. Days later, they see Pablo, a friend of Armanda; Pablo offered them a small box with a white powder that was cocaine, he said it would make them feel much better; Harry accepts it, and obviously feels better. One day, when Harry enters his room, he finds Maria naked on his bed, and deduces that it is a gift from Armanda, so he lives with Maria in a relationship that has never experienced eroticism and love. One day before the masquerade ball, Maria tells Harry about the fair where she realized she had lost him, because surely, the next day, it will be Armanda's. Harry goes to the ball and looks for his friends without finding them, and when he is leaving, he receives an almost illegible piece of paper that says: tonight, from 4, magic theater – for madmen only-.