 Hanley is pulled off the line and sent to London, where he discovers that he is to be used in a secret mission to aid a French physicist to escape occupied France before the Gestapo gets ahold of him. Hanley and the man s son were friends in college and Hanley spent one summer in France at the family s home and is the only man the scientist will trust--especially since it s been discovered that someone in the French resistance who is helping them is a double agent.