Follows a criminal gang in Rome that has a near monopoly of the city's heroin trade. Besides their internal feuding, the gang has to deal with the Camorra and Sicilian Mafia that both supply its heroin, the police led by Commissioner Scialoja and the Italian secret services.
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.