Bill Saunders, disturbed ex-soldier, kills a man in a postwar London pub brawl. Fleeing, he hides out in the apartment of lonely nurse Jane Wharton. Later, despite misgivings about his violent nature, Jane becomes involved with Bill, who resolves to reform. She gets him a job driving a medical supplies truck. But racketeer Harry Carter, who witnessed the killing, wants to use Bill's talents for crime.
A young woman follows a mysterious melody onto a remote tidal island. When she crosses back over at the next low tide, she emerges into a world where 25 years have passed.
