Agnes Belgradin is in love with a young doctor, Loring Brent. When Agnes' father dies, her mother takes her on a trip abroad. She insists that the young couple separate before they set sail, and promises that if they still love each other after a year they can reunite. But Mrs. Belgradin intercepts all the letters Agnes and Brent write one another, and convinces her daughter to marry a wealthy Australian millionaire.

To satisfy her controlling mother and secure both of their futures, a daughter hesitantly enters a loveless marriage to a wealthy businessman. Years later, after she has uncovered and overcome her mother's deceptions and manipulations, her newfound happiness is threatened with the appearance of a mysterious "man from the sea."