In 1913 the British government, hearing that the Germans are planning World War I, ask top agent Whinfrey to intervene, but instead he decides to go on holiday to Cornish fishing village Torpoint. Here he believes he has stumbled upon a smuggling ring, but in fact they are Germans who are masquerading as locals in an advance invasion party. The British arrive and arrest them, believing that Whinfrey deliberately planned everything - though it is apparent that he did not.

Married college professor Michael Lane falls in love with one of his students and hatches an elaborate scheme to dispose of his wife, Elizabeth. His murder plot goes as planned. However, he soon receives an anonymous note: "I know what you did, murderer!" Prof. Lane frantically tries to discover who knows his secret...

Number 1 has to compete against the mad Russian agent Ace Kissoff, who can change into a woman by just taking a pill.