A merry mashup of sisterly affection, parental disappointment, and bold action, Polite Society follows martial artist-in-training Ria Khan, who believes she must save her older sister Lena from her impending marriage. After enlisting the help of her friends, Ria attempts to pull off the most ambitious of all wedding heists in the name of independence and sisterhood.

When Frank and Lindsay meet on a way to a destination wedding, they soon discover they have a lot in common: they both hate the bride, the groom, the wedding, themselves, and most especially each other. As the weekend's events continually force them together, and their cheerlessness immediately isolates them from the other guests, Frank and Lindsay find that if they verbally spar with someone long enough, anything can happen.