1760. Aurora and Calandra "Cally" Kimberly hear that Valerian, the Duke of Farminster has come to their island home of St. Thomas from England to claim his prize--an heiress promised to him by marriage contract. Aurora, the true heiress, wants nothing to do with the handsome but pompous duke. Nothing could drag her away from her beautiful island home to the cold, rainy, gloomy England.Cally, on the other hand, is elated with the news and longs to put St. Thomas behind her and escape to England to live the pampered life as a Duchess. Their solution: switch places to fool the duke into marriage with the wrong sister. But fate has other plans for the sisters. Love, revenge and intrigue all play into bringing the true lovers together.