After the war Oskar, his widowed stepmother, and their son have to leave the now Polish city of Danzig and move to Düsseldorf, where he models in the nude and works engraving tombstones. Mounting tensions compel Oskar to live apart from Maria and Kurt; he decides on a flat owned by the Zeidlers. Upon moving in, he falls in love with Sister Dorothea, a neighbor, but he later fails to seduce her. During an encounter with fellow musician Klepp, Klepp asks Oskar how he has an authority over the judgement of music. Oskar, willing to prove himself once and for all, picks up his drum and sticks despite his vow to never play again after Alfred's death, and plays a measure on his drum. The ensuing events lead Klepp, Oskar, and Scholle, a guitarist, to form the Rhine River Three jazz band. They are discovered by Mr. Schmuh, who invites them to play at the Onion Cellar club. After a virtuoso performance, a record company talent seeker discovers Oskar the jazz drummer and offers a contract. Oskar soon achieves fame and riches. One day while walking through a field he finds a severed finger: the ring finger of Sister Dorothea, who has been murdered. He then meets and befriends Vittlar. Oskar allows himself to be falsely convicted of the murder and is confined to an insane asylum, where he writes his memoirs.