A man named Tom Farnon suspects his wife of having an affair, and follows her to his boat where she is to meet her lover. But a shot rings out, the other man flees, the boat explodes, and Farnon finds himself a suspect in her murder. Farnon approaches Joe Mannix and asks Mannix to learn the identity of the man she met. The best lead Mannix has is Phil Rand, another private investigator who once worked for Farnon -- but Rand insists that Mrs. Farnon never had an affair.
—aldanoli