A wholly original story of rage and revenge, of guilt and horror, and of love and loathing from the New York Times bestselling author of The Cruel Prince, Holly Black.

Tana lives in a world where walled cities called Coldtowns exist. In them, quarantined monsters and humans mingle in a decadently bloody mix of predator and prey. The only problem is, once you pass through Coldtown's gates, you can never leave.

One morning, after a perfectly ordinary party, Tana wakes up surrounded by corpses. The only other survivors of this massacre are her exasperatingly endearing ex-boyfriend, infected and on the edge, and a mysterious boy burdened with a terrible secret. Shaken and determined, Tana enters a race against the clock to save the three of them the only way she knows how: by going straight to the wicked, opulent heart of Coldtown itself.