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.

Seminary student Michael Kovak reluctantly attends exorcism school at the Vatican. While he’s in Rome, Michael meets an unorthodox priest who introduces him to the darker side of his faith, uncovering the devil’s reach even to one of the holiest places on Earth.