Pete and Mac are hired by a wealthy woman to locate her missing husband, a philanderer with a gambling problem. But the woman is murdered before they find her husband.
Pete and Mac are invited to settle a racketeer's estate, a substantial legacy left to the three women in his life but coveted by his former partner, a sadistic loan shark.
Acting only on a hunch and perhaps a bit of jealousy, Pete probes into the background of an old flame's fiance, unaware that the man is a homicidal gigolo.
In order to rescue a model abducted by white slavers, Pete and Mac pretend that the girl is a valuable pawn in a struggle between Soviet and American agents.
Pete and Mac are doing what they think is a routine background check when everyone, including the police, the FBI and the mob, want the check to stop immediately.
A ruthless businessman figures out an insurance scam. He sets his plant ablaze and lets an ex-con, who has been working there, serves as the fall guy. Mac and Pete must lead the crooked businessman to confess his deed.
Pete and Mac borrow ideas from classic detective stories to thwart a crooked small-time private eye. They're decoying him from fencing stolen jewels by concocting a case he couldn't refuse.