The Silver Queen. Sovereign, #2

The last city on Earth is contaminated. Now blood is the only thing that can wash it clean. Julia is trapped inside the Blue as the Nobles fight over the few humans who are still alive. When the dust settles and she finds herself shackled to a new master, she knows she must escape or die. Meanwhile, Cam has gathered a handful of comrades and is on his way into the Red to rescue his queen. But not all of his friends can be trusted, and not all of them will make it back alive.
The Silver Queen is the second book in Josie Jaffrey's Sovereign trilogy, set in a dystopian Europe where vampiric Nobles control the last remnants of the human race.