The Kingdom of Vinkula. The King of Darkness (#1)

Sworn to punish the one responsible for the death of her twin sister, Aurora Raven spends years searching for the murderer and ruthlessly deals with anyone who stands in her way. The relentless avenger is found guilty of numerous crimes and sentenced to five hundred years in prison in Vinkula – a dark prison kingdom. Kai, the ruler of Vinkula and master of monsters and night terrors, is also serving his sentence here. Locked in his own kingdom for a crime he did not commit, he longs for only one thing – revenge. Circumstances bring Aurora and Kai together, but the thirst for vengeance threatens to tear them apart forever. Especially when it becomes clear that the opportunity for revenge is now closer than ever.