London. Present day. Girls are disappearing. And strange things are roaming the streets.
When sixteen-year-old Lily is attacked by a two-headed dog, she's saved by hot, tattooed, and not-quite-human Regan. As Guardian of the Gates, it's his job to protect both halves of the City--new and old--from restless creatures that threaten its very existence. But an influx of these mythological beasts has Regan worried that something terrible--and immense--is about to happen.
The missing girls may have something to do with the monsters wandering around London, but what do they have in common? Can Lily and Regan find the girls and discover the truth in time to save London from being torn apart?