Ash, a sixteen-year-old twin-blood who sells his addictive venom, "Haze," to support his dying mother, and Natalie, the daughter of a diplomat, discover their mysterious--and forbidden--connection in the Black City, where humans and Darklings struggle to rebuild after a brutal war.

"In this conclusion to the Black City trilogy, Natalie finds herself separated from Ash, who is hiding out from the Sentry government. But they'll never give up their hope of reuniting and their quest to bring an end to the terrible reign of Purian Rose"--

"Ash must choose between saving the Darklings or saving Natalie"--