Mary Ainslie has been waiting 30 years for her fiancé, a sea captain, to return. She has kept a light burning in her window to guide him home. His son Carl, by another woman, arrives on vacation in the New England village where Mary lives. Mary is overcome by the resemblance between the young man and his father. The young man falls in love with Ruth, Mary's young comrade. On her deathbed, Mary wishes Carl and Ruth the romantic life that she did not live.