Business isn't exactly booming for private detective Peter Joseph Detweiler, better known as P.J.. His makeshift office is located in a bar owned by his only friend Charlie, his sporadic jobs include outwitting cheating wives, and he is not above drowning his sorrows in alcohol. When wealthy tycoon William Orbison offers him a substantial fee to become bodyguard to his mistress Maureen Prebble, he jumps at the chance. What P.J. doesn't know is that Orbison has already hired someone else to commit a murder. How this murder and the snoop's new job intersect is the crux of Universal's terrific neo-noir, "P.J. - The Merciless" from 1968.