Don Matteo is a thoroughly ordinary Catholic priest with an extraordinary ability to read people and solve crimes. He’s a parish priest who never met an unjustly accused person he didn’t want to help.

Weed smoking, foulmouthed Rocco Schiavone is an offbeat Deputy Commissioner of the State Police. For disciplinary reasons he is transferred to the Alpine town of Aosta, far from his beloved Rome. The sophisticated but cranky Roman despises the mountains, the cold, and the provincial locals as much as he disdains his superiors and their petty rules. But he loves solving crimes.

Amanzio Rastelli appointed several of his relations to managerial positions in his firm. They decided to think internationally and now business is heavily in debt. Luckily for the Rastellis, Bolta the accountant uses all the tricks of his art to cook the books, but catastrophe awaits.

Dante, a pony express in serious debt, meets Nina, a hostess stuck in Torino for the night.

Adelaide is a 40-year-old literature teacher married with children. One day, she learns about the murder of a wealthy and arrogant co-worker of hers, strangled in her own home. Adelaide meets Gaetano, the charming inspector dealing with the case and decides to help him in the investigation, much to her husband's chagrin.