The four from Bob 13

Christel, the beautiful, blonde daughter of the old master blacksmith Wangen, and the young, handsome student Fritz von Hohenstein have fallen in love. The two spend a happy, carefree time on the banks of the Rhine. This does not fit in at all with the concept of the court clerk Ensser, as the devious officer himself has his eye on the attractive blonde. When he asks for her hand in marriage, Christel immediately rejects him.

Two police inspectors track down a mysterious criminal who signs his crimes with a fiery triangle. When they have just discovered an accomplice, one of the police officers, in love with the young girl, is shot dead. His colleague will then have only one goal in mind.

Viktor Werneberg is a widowed swimming instructor with three children, who meets the sophisticated Irene Müller advice column in a newspaper. Although the two strike up a bond he is concerned that his chaotic household, including a lazy uncle Paul and an domineering housekeeper Grete, will put Irene off.

Lilian, a rich young girl, is to marry Baron de Plessis, captain of the bobsleigh team. However, Lilian is interested in Tressac, the captain of the opposing team. When everyone discovers that the baron is a burglar, Lilian can marry her lover.

A young intellectual falls in love with a circus performer and decides to cultivate her into a lady and marry her. Eventually however she decides to return to her tightrope walker lover.

A little girl falls into the hands of a hypnotist the morning after the assassination of a jeweler. A visitor of the uncomfortable host confesses himself as the perpetrator, the girl can testify and delivers the two villains of the police.

When registering in a Berlin hotel, the beautiful Lilian realizes that she apparently has a doppelganger: She is arrested as a wanted jewel thief. Lilian decides to find the woman who is preparing her next coup in Nice.

A vengeful antique dealer targets a dancer.

Axel and Bertha are a modern, emancipated artist couple in Paris. He is feminine and vain. She is financially independent, member of the women's association "Married's Women's right of ownership" and uses male nude models.

In Stockholm a young female law student investigates a series of jewel thefts that have been baffling the police.