Tracy (EVAN RACHEL WOOD) is a thirteen-year-old suburban kid who lives with her older brother Mason (BRADY CORBET) and their single, hairdresser mom. Mel (HOLLY HUNTER) hopes that she's done a good job raising her kids, but an addiction problem and a lackadaisical approach at being a traditional parent has hampered her efforts.
As have the newly arrived teen years for Tracy. She idolizes Evie (NIKKI REED), the most popular girl in school, unaware that her life is anything but peaches and cream, particularly since she has an inattentive foster mom in Brooke (DEBORAH UNGER), a would-be model.
Nevertheless, Tracy finally impresses Evie enough that she's allowed into her inner circle. It doesn't take long for Evie to corrupt Tracy's otherwise mostly childlike innocence and soon the two are shoplifting, selling drugs, getting high and more. Tracy's new rebellious attitude and behavior draws Mel's attention, prompting some tense family moments between them, particularly since Tracy doesn't like Mel's on-again, off-again boyfriend, Brady (JEREMY SISTO), who's fresh out of rehab.
With Evie eventually moving in with them and Tracy continuing her descent into outright young teen rebellion, it's only a matter of time before her relationship with her mom reaches the boiling point.