After a long period as a prisoner of war, Joachim Ott returns home to find that his wife is now living with another man.

"Route Casanova" is how people call the train driver Roland Diesler, as a love awaits him at almost every station. His colleague even has to carry out a plan extra so that there are no collisions between his rendezvous. However, when Roland looks at Ulla, the daughter of the station manager Bünau, this and father Diesler step in. They change the rosters of the two turtle doves so that they cannot see each other. But can the young couple be stopped by it?