Eager to marry his devoted
secretary Diane Lovering,
New York shipping
magnate Richard Field asks his wife Louise for a divorce. However, Louise refuses to surrender her social position and denies Richard's request. Although Diane insists that she will continue to love him without the benefit of marriage, Richard asks her to contemplate her choices while cruising to South America on one of his boats. Diane agrees to the cruise, but vows to return to New York unchanged. Soon after boarding, Diane meets Johnnie Smith in the ship's bar and rejects his flirtations. Johnny asks his smooth-talking best friend Mike Bradley for help but is double-crossed when Mike treats him like a drunk who is annoying Diane. Mike charms her and a shipboard romance blossoms. Still true to Richard, Diane makes no commitments to Mike. He persists, inviting her to visit his
ranch in
Buenos Aires. After a fun-filled day, Diane and Mike confess their mutual love. Diane finally tells him about Richard, but realizing that Mike is the man whom she truly loves, Diane promises that when she returns to New York, she will end her affair with Richard. Richard presents Diane with a wedding ring and explains that his wife finally agreed to divorce him under the condition that he not be allowed to see his sons. Overwhelmed by his sacrifice for her, Diane says nothing about her new romance. After writing Mike a
"Dear John" letter dumping him, she marries Richard. A year later, Diane encounters Mike in a New York gun shop and suggests that they dine together. In spite of his bitterness, Mike still loves Diane and senses that she still loves him. Diane explains why she is loyal to Richard. Mike visits their country house and, in spite of Diane's protests, vows to confront his rival. But when Mike sees how kind and caring Richard is with Diane, he relents and leaves. Richard reveals that he had long sensed that she was in love with another man and nobly offers to divorce her. Unchained at last, Diane and Mike begin their married life on his ranch. ==Cast==