Kent, Lasse, Olle and Sven are in their mid-twenties and have been friends since childhood. At a restaurant they meet two young women and one of them, Lena, becomes pregnant. Now, who is the father? Well, it's definitely not Kent, but the others convince him to accept the fatherhood.
People on a train get murdered. Who is the murderer? Everybody on the train is a suspect. One of them is the homosexual dope fiend played by Heinz Hopf. Things might get out of hand in this exciting thriller in true Hitchcockian style.
A woman is driving alone one evening, when she almost run over a man lying in the road. She gets out of the car to see. Suddenly the man attacks her. Eva Jansson's dead body is found by a local farmer, who calls the police. Soon after fashion designer Maj Berg comes driving the same road and is stopped by the police. When the road is cleared for traffic Mrs. Berg drives on but happens to get a flat tire. While changing to the spare wheel, she finds a black notebook in the ditch. Back in Stockholm she opens the notebook and finds a strange jotting that concerns her.
Someone is murdered. Who is the killer? Members of all star cast are all suspects...