A French playboy and an American former nightclub singer fall in love aboard a ship. They arrange to reunite six months later, if neither has changed their mind.

A pregnant teen allows her mother to pass her secret baby off as her own.

Richard, a millionaire in love with his secretary, Diane, is dispirited when his wife refuses to divorce him. Concerned that Diane will now lose interest, Richard offers her an all-expense-paid cruise to Argentina so that she can think it over. While traveling, however, Diane falls in love with fellow traveler Mike. She resolves to come clean to Richard, but upon return she becomes conflicted when she finds out he was able to get divorced after all.

Georgia Garrett is sent by jealous wife Elvira Kent on an ocean cruise to masquerade as herself while she secretly stays home to catch her husband cheating. Meanwhile equally suspicious husband Michael Kent has sent a private eye on the same cruise to catch his wife cheating. Love and confusion ensues along with plenty of musical numbers.

A terminally ill woman and a debonair murderer facing execution meet and fall in love on a trans-Pacific crossing, each without knowing the other's secret.

In a warehouse area at night, a drunk chief engineer is stabbed to death by someone who whistles. After the break of dawn, two seamen join the crew of a rusty cargo ship Kaiyo Maru. One is a troublemaker with bad attitudes, Senkichi Nomura, who pursues an enemy in order to take revenge for his father's death. The other is Keizo Sasaki, a buff, eagle-eyed man on board for a certain mission.