A murder has taken place in the “Ostend” hotel in St. Pauli and Inspector Canisius is called to the crime scene. Mentally shaken, Canisius takes up the investigation. A wide variety of guests and couples were at the hotel that night, and anyone could be the perpetrator. Canisius experiences his most difficult case, in constant fear for his son.

The Film begins with an emphatically serious discussion between Kolle, the sex researcher Professor Hans Giese, and the psychologist Wolfgang Hochheimer. After that follow the first play scenes. In a buoyant conversation, two model cases of sexual difficulties in marriage and their causes are discussed. A newlywed couple one the one side and a couple already married for seven years on the other side discuss about their problems. The words are illustrated by play scenes, short comments which point to the consequences of a lack of sexual education are inserted in between. With the newlyweds, the premature orgasm of the husband causes his wife woes as she is missing the loving foreplay and aftermath. The second husband, an architect who has become father of two children in the meantime, in contrast, neglects his wife in favour of his job.

Three episodes depict events that actually took place in the years before the film was made. Three true‐life dramas explore teacher–student taboos: 1. Monika: A young teacher’s love for his pregnant 17‐year‐old student leads to his self‐incrimination amid legal peril. 2. Sybille: A 15‐year‐old fabricates a scandalous affair with her bachelor principal, ending in his suicide. 3. Fantasie: A 13‐year‐old boy’s infatuation with his teacher drives him to violence and a troubled return to reality.

1964 in Berlin, not long after the raise of the wall that separated the city: ex-prisoner Bruno is chosen by the eastern secret agency to be sent west with a special order. However as soon as he's crossed the border, he reports to the police. He claims his order was to kidnap someone, but he doesn't know who yet. He's forced to continue feignedly. However the east agents don't really trust him and play a double game...