 12-year-old Laurie is a reluctant passenger on a family outing with her psychologically fragile mom, Liz, and her baby sister, Dani. When the car breaks down en route, the pressure of expensive car repairs and unhappy daughters drives Liz to her breaking point. As Laurie struggles to keep the trip together, she begins to realize that Liz may not be capable of being a mom to her and Dani again.