After a bank robbery, the robbers see Tiberio, Inspector Belli's father, and one of the criminals convinces his accomplices not to kill him. Tiberio tells his son that he recognized an ex-friend of his. Belli will try to convince him to turn himself in. The police officers of the police district find themselves having to protect Natassia, a Yugoslavian girl, whose daughter has been kidnapped by two Albanians to force the woman into prostitution.