Trois amies, Deborah Bishop, Rita Phipps et Laura May Hollingsway, embarquent pour une croisière. Mais au moment de partir, elles reçoivent une lettre d'une relation commune, Addie Ross. Celle-ci les prévient qu'elle part avec le mari de l'une d'entre elles. Mais lequel ?

Joel and Garda Sloan, a husband and wife detective team, who also sell rare books in New York, take a vacation to Seaside City. At Seaside, Joel's pal, Mike Stevens is managing and preparing for their beauty pageant. Joel is made one of the judges plus he has invested $5,000 in it, to Garda's dismay. Eric Bartell, promoter, arrives to dupe Stevens. When Ed Connors, New York racketeer arrives, Bartell is mysteriously murdered. Joel and Garda set out to investigate the murder.