Luise and Theo pick up a mysterious guy, Frank, and give him a lift to Berlin, where Luise flirts with him. He, however, is more interested in tracking down Laura Luna, the woman who wrote the book "Tiger-Stripe Woman Waits for Tarzan." He's fallen in love with her picture and wants to take her back to the future, a time from which he came, when women have died out. Frank and Laura are united. Frank also asks Luise to join them, creating a menage a trois.