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.

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.

During the security service at the city stadium, Coliandro and agent Balboni arrest an ultra who had tried to stab a policeman: terrified of ending up in prison, the boy collaborates and provides the policemen with some important information.

Agent Gargiulo shows up at Coliandro's house in the middle of the night, drunk and with a bloody knife in his hand: the inspector tries to reconstruct what happened, but it doesn't seem easy.

In the trial against the boss of the Casalesi clan, the Bologna prosecutor's office has to rely on the testimony of Jelena, who now lives under protection. Coliandro, still in love with the woman, learns of her new cover and decides to go and see her. But there he has to contend with two fierce killers.

As punishment, Coliandro was transferred again, this time to the boring dog department. Here her sister comes to visit him, very worried about her daughter Angelica, who is dating a boy close to a satanic cult.

Natasha, a beautiful international killer, arrives in Bologna chased by secret services from all over the world. Coliandro will have to defend her from them... and himself from her.

Following a fall, Coliandro loses his memory and temporarily becomes a real tough guy, joined by a young nerd in the hunt for a band of international terrorists.

After shooting two boys, Coliandro is forced to attend a beautiful psychologist of the Ministry, engaged in the recovery of agents more prone to the use of firearms.

Investigating the death of his cleaning lady's nephew, Coliandro uncovers an extreme fighting ring involving a series of wrestlers who are systematically drugged to relieve pain and fatigue. Helping him unravel the case is Veena, a beautiful and athletic fighter who escaped from this group of modern-day gladiators.

Coliandro witnesses a clandestine race between two motorcyclists but one of them loses control and causes the other to fall, who is killed. The inspector and Buffarini manage to save the motorcyclist responsible for the accident and find refuge in the police station but will have to deal with the bloodthirsty boss of the area, brother of the deceased pilot, who seeks revenge.

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".