Poor orphan Kate Daltrey appears at a ball in Prince Gabriel's castle under the name of her half-sister, but she does not remain incognito for long. Very soon Kate and Gabriel will be swirled in a whirlpool of ardent, frantic passion - but this is a passion without a future. After all, the prince is about to marry a Russian princess, and proud Catherine refuses to accept the humiliating role of a favorite... It would seem that a sad end is inevitable. But true love can work miracles!..