Two thirty-something couples along with their perpetually single pal Nick have been best friends for years. All of that changes when Nick finally get engages to a girl named Victoria. From that moment, he seems to change, driving a wedge through the groups' tight friendship. One night, the couples jokingly speculate on how they would kill Victoria in order to save Nick from making "the worst mistake of his life" by marrying her. Fantasy quickly gives way to reality in a nightmarish weekend gone-wrong.