When the glamorous Grosvenor sisters arrive in the exclusive Hamptons beach town of Little Elbow, they can't help but cause a stir. Gorgeous Grace and Charming Charity are soon hot favourites on everybody's guest-list. Except that of their neighbour, Marcella Hunter. Heiress Marcella doesn't want the competition and when Grace starts dating Marcella's 'Plan B' man - dull but extraordinarily rich Choate Fitzgerald - the gloves are off. Marcella determines to find out where the sisters really came from. And exactly how they can afford to rent a six-bedroom beach house in this millionaires' playground. In the process, however, it's discovered that quite a few of the people spending that summer in Little Elbow are not exactly what they seem . . .