A Nigerian girl is killed. After a series of blunders, Coliandro is accused of being racist. He is taken off the case and assigned to escort Kiru, the victim's sister, from Nigeria. The two wind up having a passionate affair as Coliandro discovers that the victim was actually a maid killed by Kiru's sister, who was trying to get her hands on a large sum of money.

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.

Chinese child vanishes, leaving behind a dragon key ring. Urged on by his sweet but insistent niece, Inspector Coliandro, theoretically on leave to look after the little girl, begins an investigation of his own within Bologna's Chinese community.

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.