Diamond promises a dying gangster that he will take care of the gangster's girlfriend, unaware that the promise will endanger his life.

A woman in the hospital hires Diamond to trail her ex-husband, who she believes has obtained custody of their daughter to use as cover for his shady business practices.

A man hires Diamond to watch over his frightened wife while he is out of town, but then Diamond is approached by a pair of doctors from a mental institution who claim she is an escaped patient.

Diamond sets out to con a recently widowed woman and her lover into believing that he witnessed them kill her late husband so that they could collect the insurance money.

While on holiday in the mountains Diamond befriends a young woman who is being pursued by thugs who believe that she has taken some incriminating photos.

Diamond finds himself facing off against the mob when is hired by a woman to prove that her fiancee is innocent of killing a man in a hit and run auto accident.

Diamond poses as a rich Canadian and infiltrates a gambling racket in order to learn the truth about a businessman's claims that he witnessed a murder.

Diamond unravels a story of unrequited love and revenge while tracking down a fugitive gangster who is in the possession of a valuable stolen necklace.

Diamond plays a game of cat and mouse with an escaped convict who bears a grudge against Diamond for bringing him to justice.

Diamond is hired to verify the authenticity of an ancient Greek statue, which is suspected of being fake when it is offered for sale at a figure far below its true value.

Diamond attempts to convince an old war buddy who has turned to a life of crime to give himself up to the authorities.