Leigh (Kristen Bell) is almost 30, and living a seemingly perfect life in New York. But when her career and love life both come crashing down, she flees to her suburban hometown and regresses right back into teenage life – behavior. She moves into her old room with her parents, hangs around with friends who never left town, and reclaims her high school job as a condo-complex lifeguard. But as Leigh enjoys shirking off adult life and responsibilities, and enters into an illicit affair, she begins a chain reaction that affects those closest to her.