High school senior Lily and her three best friends live in a world of selfies, emojis, snaps and sexts. But when their town of Salem is besieged by a massive data hack, resulting in half the citizens' private info spewed into the public view, the community descends into anarchy. Lily is targeted after being falsely blamed for the hackтАФand bands together with her friends to survive a long, blood-soaked night.