Faber is a top German spy living in England, informing his superiors of troop activities, and avoiding detection at all costs. At first, he blends in with his surroundings quite well, and goes about relaying information without arousing suspicion until the eve of D-Day in 1944.
Eventually, just as he discovers that the invasion is to take place on Normandy, several figures take notice of him, and he forced to escape with film proving that the Allies have been misleading German air reconnaissance about the eventual point of invasion of the mainland.
He escapes in a small boat during a storm, and is shipwrecked on a small island, barely escaping with his life. On the Isle of Storms, in near isolation, live a paralyzed ex-RAF commander and his very lonely, neglected wife Lucy. She and the spy have something in common - neither has felt appreciated or truly loved in years. The two have an affair, and as he attempts to covertly contact a German submarine for retrieval, the truth about his past is thrust upon her. Though having fallen in love with Faber, Lucy nonetheless prepares to turn the man in when he kills her husband. In the end as Faber races against time to make contact with the U-boat and stop Lucy before she blows the whistle on him. She kills Faber and unbeknownst by her, wins the war.