Two gangs of drug traffickers try to control the monopoly of drugs in the city, while the police commissioner tries to kill them with the help of a snitch, "the puppet".
Giácomo is an Italian man in his forties who is single, dedicated to earning money in his business. He strikes up a relationship with a Spanish singer, whose brother encourages her to conquer him to take her money.
At the core of this enormously bleak melodrama, there is a beautiful, passionate woman (Florence Marly, Chenal's wife) who capriciously oscillates between two men (Chiola, De Paula), even though she knows her fate is fatally linked to one of them.