Mr. Monk Meets the Godfather

S3, E5: When an unknown gunman shoots up a barbershop owned by the mob, Monk is called on by Salvatore Lucarelli (Phillip Baker Hall), the West Coast Godfather, to find the killer and prevent a mob war. Monk initially wants nothing to do with the Lucarelli family, but the Feds convince him to take the job and help bring down the entire organization.