Never mix business with pleasure. For badass secret agent Sam (Rebel Wilson), that hasnt been difficult. But now shes tasked with one of the hardest missions yet being maid of honor for her childhood best friend. Deep out of her comfort zone, Sam barely maintains her cover as a dependable friend even on the day of the extravagant wedding. And whats worse, the three bridesmaids are judging her every move. But when a team of mercenaries take the uber-wealthy wedding guests hostage, its up to Sam to do what none of the other bridesmaids can wage war on anyone who would ruin the most important day of her best friends life.