The story of two disconnected sisters summoned home to clean out their childhood bedroom before their parents sell the family house. Looking to recapture their glory days, they throw one final high-school-style party for their classmates, which turns into the cathartic rager that a bunch of ground-down adults really need.

Arriving at her new college, Beca finds herself not right for any clique but somehow is muscled into one that she never would have picked on her own: alongside mean girls, sweet girls and weird girls whose only thing in common is how good they sound when they sing together. When Beca leads this a cappella singing group out of their traditional arrangements and perfect harmonies into all-new mash-ups, they fight to climb their way to the top of college...