British intelligence is trying to solve the problem of German submarines attacking British merchant ships during World War II. Thousands of tons of goods are being lost, and it is believed that information is getting to the subs via a radio transmitter in one of three German ships in Portuguese Goa. Because Portugal is neutral in the war, the British forces cannot attack the ships, so a group of older British expatriates are called upon to do it for them.

British intelligence is trying to solve the problem of German submarines attacking British merchant ships during World War II. Thousands of tons of goods are being lost, and it is believed that information is getting to the subs via a radio transmitter in one of three German ships in Portuguese Goa. Because Portugal is neutral in the war, the British forces cannot attack the ships, so a group of older British expatriates are called upon to do it for them.