Malcolm Stevenson, a wealthy ex-naval officer haunted by his memories of the war, finds his lonely life turned upside down one night when he runs into trouble on a road near the coast. What at first appears to be an accident leads him to discover an international conspiracy against his country—and to fall in love with a dance hostess who seems to have something to do with it. Malcolm’s determination to expose the plot will put his life—and that of the only person who has brought him any happiness—in grave danger.