The Netherworld — K.N. Lee

Angels protect us from the escaped creatures of the Netherworld. Demons seek to destroy the balance and treaty between vampires and humans. One half-blood vampire is torn between the two worlds in this action-packed paranormal thriller. Introducing Koa Ryeo-won, a half-blood vampire with an enchanted sword and a membership to the most elite vampire castle in Europe. A vengeful demon threatens everything Koa has worked hard to protect. Not even Halston and his legendary infinity gun can stop him, but Koa's mother might be strong enough to do it--if only her curse can be broken. There is one vampire that can help. First stop, the Ivory Tower, where only the most notorious supernatural beings are kept. But even that won't be enough. Koa must prepare herself to return to the place that nearly killed her. The Netherworld.