1931. The new, luxurious transatlantic liner Empress of Britain is on her eastward passage. Among the first-class passengers on board are two English confidence tricksters, making a discreet exit from a scam they have left behind them in the United States. A chance meting on deck brings them a tempting new target in the shape of the beautiful and wealthy heiress, Diana Charnwood. It's a trick they've pulled before, with some success. Charm the daughter into an engagement to marry, then get the father to buy you off.