A detective friend of Barnaby who is intent on catching a murderer, has been receiving letters from the man who is taunting him. But when he gave him too much information the man kills him and Barnaby sets out to find him.
Barnaby is hired by a woman to locate her fiancé; who disappeared along with some her valuables. The man who is a conman, has moved on to his next mark but one of his former victims finds him and threatens to reveal all to his latest mark so he kills her. At the same time some of the woman's friends catches him in a lie.
The owner of a basketball team is informed that his star player once threw a game. The person who told him that, wants him to make sure that his team loses a game. So the owner kills him. Barnaby is hired by the man's wife who is the sister of the player to find him.