A heart of bitter poison

"An executioner and a bounty. A soldier and a weapon. The hunter and the prey that won't go down. After centuries in hiding, the last of the original sirens took a chance on love. And it blew up in her face. Imprisoned by the Shadow Realm, Lu's days now pass in a haze of torture and tears. She's the most ancient vampire siren, the weapon they can't work out. Halfway to a hybrid of immortal creatures, she could be the key to their plans for war ag...