In a theme reminiscent of the classic Greek comedy Lysistrata by Aristophanes, wives and sweethearts in a Bavarian village agree to withhold sex from their men, as long as the men keep spending time with a new waitress at the inn.

The physician Dr. Deruga is suspected of having poisoned his wife out of greed. She died after naming Deruga, poor and in debt, the sole heir in her will. There are a lot of people willing to testify against him in court, including Marta, the dead woman's best friend. Only his niece Mingo believes him to be innocent and goes out on her own to prove it.

Sabine Heitmann, the young boss for the shipping company Heitmann, has become friends with Michael, the First Officer and Helmsman of the ship, the "Sabine Heitmann". He only knows Sabine by her first name and doesn't know that she's the boss. When he discovers the fact, however, he gets pissed and refuses to accept his promotion to Captain. Then the shipping company gets a lucrative offer: In a competition with another shipping company, they need to reach Baltimore in 18 days and pick up some freight. Whoever can move their rear ends faster, gets the very profitable contract from an American firm (correct me if I'm wrong, but didn't this sort of thing sink the Titanic?). Together with Michael, Sabine comes up with a plan, which should have them win the contest. The upshot? She wins back his heart and he becomes Captain.

The Minerva Mines Company is interested in transporting two particularly valuable diamonds from Cape Town to Amsterdam. To confuse potential thieves, two detectives are sent on two different ships with steel suitcases and they have no clue whether they’re carrying pebbles or diamonds. Nevertheless, a collection of questionable characters come on board both ships. The hunt for the diamonds begins; the suitcases are stolen; everyone is suspect.

Nora, the wife of the architect Heinz Ottendorf, feels neglected by her husband. He is getting more and more engrossed in his work, but Nora, apparently a stranger to hard work, suspects that the real reason for her husband's diverted attention must naturally be another woman. Robert, the cousin of Nora's friend Marianne, has long been in love with Nora and sees an opportunity to win her hand. Heinz, for all his distractions in his work and the phantom lover he doesn't have, isn't quite ready to let Nora go. While he may be married to his work, his work is a fickle mistress: he makes a career error and this leads to near financial ruin. He begs Nora to be patient with him. Marianne, who for her part is in love with Heinz, spins a web of deceit and intrigue, which leads to Robert taking a potshot at Heinz and then eventually causing Robert to kill himself.