A famous industrialist is murdered at a restaurant in Malmoe. 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?

Jojje, Roffe, Sivert, Lillen, Peggy and the dog King are a tight-knit group of friends. When it turns out that King is sick and soon to die, his friends decide to give him his best time.