Never mix business with pleasure. For badass secret agent Sam (Rebel Wilson) that hasn't been difficult. But now she is tasked with one of her toughest missions yet - being the maid of honour for her childhood best friend. Depp outside her comfort zone, Sam barely maintains her cover as a dependable friend even on the day of her friends extravagant wedding. What's worse is that the three bridesmaids are judging her every move. But when a team of mercenaries take the uber-wealthy wedding guests hostage, it's 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.