Coliandro investigates together with Jamila, a young and brilliant agent of the French services, on Tarantola, an apparently perfect policeman who, through the fixer "Don Lurio", is the terminal of a gang of corrupt agents.
Coliandro comes across Francesca Maria, the elegant and refined curator of a museum able, with her seductive qualities, to always get what she wants. Dazzled by the woman, the Inspector has to face Masino, an unscrupulous art dealer with a disturbed personality.
Italian police inspector Coliandro — an ignorant, boorish, but fundamentally kind-hearted oaf, whose entire worldview is informed by American cop movies — protects the good citizens of Bologna, routinely saving the day and foiling the plans of evildoers of all sorts by a combination of dumb luck and genuine bravery, while always falling hopelessly in love with the woman at the center of the case.