Returning to school after the unsolved disappearance of her mother, teenager Jill Estrada can't wait for things to return to normal . . . even as her friends become compulsively obsessed with Box Killers, a true-crime subscription game where each month's "unsolved case" is custom-tailored to the life of its player. There's only one catch: Jill's game seems to be all too real . . . and when her clues begin to connect to a series of disappearances in her town, Jill and her friends must uncover the truth behind these mysterious crimes before one of their own becomes the next victim.