Thea Denny hates the tenth grade, and her home life isn’t easy. But she’s passionate about making art — and about her math-genius boyfriend, Cam, a recent transfer to her upstate New York high school from California. One day Cam mysteriously vanishes — and then things really get weird. The stars on the school flag go missing, eerily cut out. Intimate videos of Cam and Thea start going viral online — videos they never took. The FBI gets involved. And Thea can hear the voice of Melody — a beautiful, disabled girl her age, whose illness has left her mute since birth. Cam once claimed to be the world’s foremost hacker. . . . Is he trying to reach her, send her a sign — or is Thea losing her mind?