Lacy Steele has been dispatched to the Hamptons with the tall order to make amends with her estranged sister, Riley, and her ex-fiancé, Robert. The time has come to decide which of her friends to take as her date: Tosh or Jason. As if to add to her already high stress level, she'll be spending the weekend with Robert's certifiable family, and his aunt has declared a ban on dessert.