Lonely Road — Nevil Shute

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.