"Everyone has secrets. Mags's has teeth. Magdalena Herrera is about to graduate high school, but she already feels like an adult with serious responsibilities: caring for her ailing grandmother; working a part-time job; clandestine makeouts with a girl who has a boyfriend. And then there's her secret, which pulls her into the basement each night, drains her of energy, and leaves her bleeding. A secret that could hurt and even kill if it ever got...