A war between mafia gangs seems to have broken out in Bologna. In the same days Nikita, a girl who works as a pony express, finds 250,000 euros in cash in a package to be delivered. Frightened, the young woman goes to the police station where she meets Inspector Coliandro, who begins to investigate.

While Trombetti is taking his niece Angelica home, accompanied by Coliandro, his car is rammed by a scooter driven by a Chinese boy who immediately vanishes into thin air.

A suspect dies during a police operation in the difficult Pilastro neighborhood, apparently killed by a gunshot from Inspector Trombetti's weapon. Coliandro investigates to try to exonerate his colleague.

A young black girl is killed during what appears to be a voodoo ritual. Coliandro is entrusted with the task of taking care of the victim's sister, who has arrived in Bologna from Africa.

During a nocturnal chase in the streets of Bologna, a girl steals his gun from Coliandro. While trying to track down the unknown, the inspector comes across a dangerous criminal organization.

On the estate of a very wealthy man, an escort is cruelly murdered at the hands of a cold and determined assassin. The investigations lead Coliandro to confront the world of high class prostitution.

Coliandro gets involved in a bank robbery in the center of Bologna. The three robbers, young and inexperienced, are soon rendered harmless by three hostages, who, in turn, take the other people hostage.

Two gypsy girls steal something very important from the house of the wrong person, a corrupt marshal of the carabinieri, who, with an ambush, tries to take revenge. Thus, one of the girls takes refuge in Coliandro's house in search of help.

Kayo, a young Japanese doctoral student in art history, is an involuntary witness of a ruthless execution. She casually runs into Coliandro, who decides to protect her and hide her at her house with Kenzaburo, her brother. The man, who arrived from Japan in defense of his sister, is a former repentant of the yakuza, the fearsome Japanese mafia, which is hunting them.

Coliandro seems to be on the verge of positively concluding a gallant adventure. But, at the climax, Giacomino shows up at his house, sleepy, hungry and with handcuffs on his wrists. The motivation is incredible: Giacomino is accused of being the author of a series of brutal murders. To help his friend, Coliandro will have to hunt down the real serial killer.

Coliandro is forced to be Paffoni's dance partner for one evening. To escape the thankless task, he finds himself investigating the murder of a young singer. To help him there is not only Paffoni, an experienced dancer, but also Natascia, the new young and beautiful singer of the smooth orchestra led by the shady Vasinto and his wife Ersilia called "Vagona".

At the Questura Coliandro meets Asmareth, a young and beautiful Eritrean cultural mediator who works for the police. Believing her to be an illegal immigrant, Coliandro puts together one gaffe after another. To make up for it, he agrees to help her in a research that the girl is doing on illegal work. Coliandro and Asmareth thus unmask a gang that organizes "manhunts" for bored provincial rich people.