The Coldest Girl in Coldtown

Coldtown is dangerous. A prison for the damned and those who party with them. From the New York Times bestselling author of The Cruel Prince comes a deliciously dark YA novel for fans of Twilight and The Vampire Diaries. 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. It's an eternal party, shown on TV 24 hours a day - gorgeous, glamorous and deadly! The only problem is, once you pass through Coldtown's gates, you can never leave ...
When Tana wakes up one morning after a perfectly ordinary party, she finds herself surrounded by corpses. The only other survivors of the massacre are her 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 heart of Coldtown itself.
A wholly original story of rage and revenge, love and loathing from bestselling and critically acclaimed author of The Spiderwick Chronicles and The Folk of the Air series, Holly Black.