Cage of Gold (1950)

A young woman, Judith Moray, deserts her prospective fiance, the nice doctor Alan Kearn, for an old flame, the dashing but roguish former wing commander Bill Glennan. Glennan makes her pregnant and marries her, but leaves her on the morning after the wedding when he learns that her father can't offer him financial support. Two years later she - having been told that Glennan is dead - has married Kearn and borne him a son. But then Glennan suddenly reappears and begins to blackmail her.