Sixteen-year-old Cara Lange has always been a loner, even more so since she moved away from her best and only friend, Zoe, a few years ago. Cara mostly spends her time avoiding the popular girls who call her 'choker' after a humiliating incident in the cafeteria, and watching Ethan Gray from a distance, wishing he would finally notice her. Then one day Cara comes home and finds Zoe waiting for her.