A young American girl is found dead in Göta kanal, Sweden's largest canal. Since there are hardly any clues or evidence at all it seems as if the murder can't be solved. Martin Beck and his men are assigned to the case. Soon they find a likely suspect and together with a police woman they begin a cat and mouse game to catch him.
A serial-killer attacks and murders young girls in the public parks of Stockholm. The police has trouble finding any evidence to find the killer. But when a newsstand is robbed in one of the parks while the murderer strikes again, police inspector Martin Beck believes that the robber may be an important witness.
A routine mission ends up in a flaming inferno when a house suddenly explodes. It looks like a spectacular suicide attempt but the technical investigation reveals unexpected evidence. Beck and his men are soon on the tracks of a narcotic syndicate...
A famous industrialist is murdered at a restaurant in Malmö. Police inspector Martin Beck in Stockholm gets the case. The suspects lead to people involved in illegal arms deals. But who was the biggest criminal, the murderer or the industrialist?
A woman is found murdered in a closed amusement park. A young couple who happen to be there at the same time become, without their knowledge, suspects for the murder. They are chased by a large number of police but only criminal inspector Martin Beck believe they are innocent.
The gardener decides to avenge the death of his mentally disturbed wife by killing the men he considers responsible. One of them is a pop star that takes part in great marathon race in Stockholm. While the killer methodically prepares and patiently waits his victim, Inspector Beck and his men must determine the exact location of the shooting on 42 kilometers of path before it's too late.