The gritty New York City streets of the 1920s are inhabited by vampires in this lively mythological romance. Zephyr Hollis is an underfed, overzealous social activist who teaches night school to the underprivileged of the Lower East Side. Strapped for cash, Zephyr agrees to help a student, the mysterious Amir, who proposes she use her charity worker cover to bring down a notorious vampire mob boss. What he doesn't tell her is why. Soon enough she's tutoring a child criminal with an angelic voice, dodging vampires high on a new blood-based street drug, and trying to determine the real reason behind Amir's request - not to mention attempting to resist (often unsuccessfully) his dark, inhuman charm.