Friends and family convene at a beach house for the wedding of Lila (Paquin) and Tom (Duhamel). But things don't go swimmingly, mainly because of one thing that Lila and her maid of honor, Laura (Holmes), have in common - Tom, the groom. Laura and Tom were an item before Lila came along and nobody seems able to forget that. With very few successful marriages to look up to, and friends that she's not sure she can trust, will Lila be able to go through with the wedding?