Irene Foote agrees to marry Crosby, a member of the New York Stock Exchange and the pick of her affluent New Rochelle parents, but while sea diving, meets Vernon Castle, a dancer, and promptly falls in love. After moving to Paris, the young couple, now married and fighting starvation, splurge one evening and visit the Café de Paris. At the request of a rich American, the Castles perform a dance and become an overnight sensation, eventually returning to New York to open their own club, Castles-by-the-Sea. Crosby, now a theatrical producer, plans to open a musical on the same night, but knowing the Castles are the bigger attraction, connives to stop them by hiring thugs to kidnap Irene. With great daring and the help of his dog, Vernon catches up to Irene and rescues her from Crosby's clutches. After a series of mishaps, the dancing duo arrives at their club in time for the show, and Crosby loses all.