Der Steppenwolf.

A story that focuses on the loneliness and suffering of the protagonist, Harry Haller, who feels that he has no place in a world filled with meaningless frivolity. Having decided to take his own life a chance encounter causes him to change his views and he begins to learn ways to enjoy life. One of the most misunderstood of his novels the book is, according to Hesse, about the possibilities of transcendence and healing.