Richard Diamond, Private Detective

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

A man hires Diamond to investigate an outer space society which he suspects is out to bilk his rich uncle since they have talked him into leaving the society $100,000 in his will.

Diamond moves to Los Angles where he begins to date Karen after she hires him to find her boyfriend's murderer. A woman hires him to find her playboy son who has gone missing.

A racketeer's bookkeeper gets Diamond involved in a blackmail scheme against his boss, when he asks him to find a book and gives him only one hour to do so.