The sister of a sponge diver killed by a stingray loves an escaped convict posing as a priest.

Ivy Stevens is a cafe entertainer in love with a shifty salesman who deserts her. In attempting to commit suicide, she is saved by Carl, a Salvation Army officer. Encouraged by Carl, Ivy joins the Salvation Army. When her old flame re-enters her life, Ivy finds she is still attracted and begins another affair with him.

The murders start with the body of Robin. He is found with a arrow through the heart, but Vance deduces that the body was placed and not found where he was killed. The note found dealing with the murder was part of a nursery rhyme and signed by 'Bishop'. The only witness may have been Mrs. Drukker and Adolph, but they are not talking. As the murders progress, each one is accompanied by a nursery rhyme. It is up to Philo Vance to unravel the clues and unmask the identity of the murderer 'Bishop'.