We are in 1945, in the middle of the world war. Following his return from Egypt with his daughter Catherine, Colonel Stewart is recruited by the British secret service MI6 as a liaison agent in New York. His mission is to help the U.S. Army protect the oil supply convoys, which leave New York for England. The American oil tankers are being sunk at the mouth of New York Harbor by German submarine U-boats. In addition, the Allied forces are planning a landing in Europe to launch an offensive against the German front. Will the Colonel be able to count on the help of a friend who has a unique network of contacts to help him accomplish his mission? Welcome to the world of the MI6 secret service.