Rebel Wilson stars as Sam, a no-nonsense secret agent who finds herself in an unexpected role: maid of honour at her childhood best friend's lavish destination wedding. But when a group of mercenaries crash the celebration and take the guests hostage, Sam must spring into action. Armed with nothing but her wits and a few unconventional tools, she navigates high-maintenance bridesmaids, dodges bullets, and ensures the big day goes off without a hitch - all while keeping her identity under wraps.