A chilling middle school novel from the New York Times bestselling author of Mystery of Locked Rooms, three kids must discover who--or what--is terrorizing them after receiving an ominous meme on Halloween night. "A creepy, freaky, fun-as-anything tale."--Chuck Wendig, New York Times bestselling author of Dust & Grim On Halloween night, Josie and her two best friends, Jackson and Alison, sneak into...