The first book in a dark and swashbuckling middle-grade series about a girl who stumbles on an underground secret when her dog (and best friend) is snatched. Zoe lives in a New York apartment block with a mostly-absent mother, a succession of babysitters and her beloved three-legged dog, Zorro. But when Zorro is snatched, Zoe's investigations lead her to a secret band of fellow children fighting a rising, underground threat...