No matter how old you are, you never get over high school. Successful PR pro Marni (Kristen Bell) heads home for her older brother's (Jimmy Wolk) wedding and discovers that he's marrying her high school arch nemesis (Odette Yustman), who's conveniently forgotten all the rotten things she did so many years ago. Then the bride's jet-setting aunt (Sigourney Weaver) bursts in and Marni's not-so-jet-setting mom (Jamie Lee Curtis) comes face to face with her own high school rival. The claws come out and old wounds are opened in this crazy comedy about what happens when you're reunited with the one person you'd like to forget.