When Claire decides to get married, her sister Anna is thrown into an existential crisis. Afraid to lose the only person she ever depended upon, Anna teams up with Art, the groom's roommate and best man, to break up the relationship and preserve the status quo. Armed with a whiteboard, they plot and scheme, but their efforts blow up in their faces. However, circumstances soon present Anna a real opportunity to end Claire's marriage. Will she yield the power to her advantage or face the truths she has been avoiding her whole life?