Coliandro, a young, low-ranking police officer in Bologna, accidentally comes into contact with Nikita when she comes to see a colleague of him in another department. She wants to show him a suspect package that she has been given to deliver. Coliandro, seeing this as his big break in the force, offers to help her. The package contains a large sum of money in cash and a mysterious floppy disk that blocks the police computing system. When they try to deliver the package to the addressee, they find him dead in his office.

Inspector Trombetti returns fire during a police operation in a dark garage. When the lights come on, the body of a local gangster is found, but he was unarmed. Trombetti is suspended, and there are even rumours that he once worked for the gangster. Coliandro, convinced of his friend's innocence, clears Trombetti and discovers who the dishonest cop really is, all with the help of the gangster's sister, with whom he falls in love.