Frank Johnson (Ross Elliott), sole witness to a gangland murder, goes into hiding and is trailed by Police Inspector Ferris (Robert Keith), on the theory that Frank is trying to escape from possible retaliation. Frank's wife, Eleanor (Ann Sheridan), suspects he is actually running away from their unsuccessful marriage. Aided by a newspaperman, Danny Leggett (Dennis O'Keefe), Eleanor sets out to locate her husband. The killer is also looking for him, and keeps close tabs on Eleanor. Written by Les Adams [email protected]

On leave in a shore side town, Johnny becomes interested in a young dark haired woman. They meet and he learns that she plays a mermaid in the local carnival. After strange occurrences, Johnny begins to believe that she may actually be a real mermaid that habitually kills during the cycle of the full moon. Written by [email protected]