While perusing the books of an engineering company, fastidious auditor Frank Manning encounters rum goings on when he is approached by a woman who claiming she is being blackmailed. She begs him to find certain letters and he eventually agrees. Having obtained the letters, he takes them to a specified address where, to his horror, he finds a man, fully clothed, dead in the bath.

An unmarried couple are forced to adopt a series of pretexts when they stay at a country inn together with only one spare room.

A blackmailer is murdered, and the police find that there is a long list of suspects who wanted to see him dead.

A chance photograph may reveal a murderer's identity - and someone's after the photographer!

A woman travels to England to attend her parents' funeral. She is told by officials that they died of natural causes together, but she doesn't buy it. She comes to suspect that the nurse who took care of her parents was involved in their deaths, but since the nurse is well thought of in the town, no one believes her. What she doesn't know is that her parents' killer has selected her as the next victim