Don Matteo's mission is to unmask the guilty and make it clear that, between evil and good, the latter is the only way to live well with oneself and with others. This detective, in the service of God, possesses an extraordinary intuition which, combined with his deep knowledge of the human soul, successfully guides him into the very depths of crime. Generous, simple, cunning, intuitive, intelligent, meticulous, tenacious, informal, without prejudice: his main task is to awaken consciences in good people.