Matthew and Louisa are about to celebrate the biggest day of their lives, but their wedding becomes the perfect venue for their dysfunctional family to confront what tore them apart in the first place. Of course, when you marry your brother's ex-girlfriend, and force your separated parents to be in the same place at the same time, fireworks are bound to go off! Drinks will flow, insults will be hurled, and punches thrown at this catastrophic wedding.