Crime writer Andrew Dax and his gorgeous wife Kate go on holiday to a country cottage, where they receive an unexpected visitor, the bossy Miss Tulip, who needs shelter for the night. In the morning, there's a dead body in the house.

A professor teaching at a correspondence school discovers that a Nazi agent is trying to prevent a trade treaty being signed between England and South America.

A boxer and war-time Telephone Engineer (Lee Patterson) is lured into a murder cover-up plot by a scheming woman ( Faith Domergue).