The police officers of the Sant'Andrea police station investigate a gang specializing in robberies in supermarkets. During the investigation, the policeman Tommaso De Rosa, who monitored the movements of the suspects, was killed.

A man shows up at the police station to report the disappearance of his daughter: Inspector Elena Baroni will investigate the case. Meanwhile, the search for the culprit in Tommaso De Rosa's death continues and Commissioner Cafasso reveals his suspicions about a colleague of theirs to Inspector Pietro Guerra.

Alfredo Spinosi, owner of a building company, is found dead. The investigation will lead to a swinger club tour.

An explosion of malicious origin took place in the house of a Neapolitan merchant: Guerra understands that the shopkeepers in the neighborhood where the merchant lives are all victims of extortion by a felon. During the investigation, the commissioner will discover that even one of his men is corrupt and has ties to the local underworld.

Agent Paolo Esposito, whose involvement in the affairs of the underworld was discovered by Guerra, decides to collaborate with the judiciary, but to improve his position he has Sanniti, head of the organization in which he was an accomplice, indicted. Angelo, a friend of the agent Stefano Depretis, is killed with the pistol stolen from the superintendent Antonio Ramaglia.