Natalia and Aleksei Zhebolov are not your everyday brother and sister. They are the private assassins for the leader of the largest crime syndicate in the world. And they are very good at their job. Kidnapped as children, they know no other life. But Nat and Alex have an even bigger secret. Their captors performed experiments on them that transformed them into something more than human. All their lives they have dreamed of being free, but their master have no intention of letting their greatest weapon go. Now Nat and Alex are sent on their most difficult mission yet. It will test not only their physical abilities; it will test their loyalty to each other, themselves, and the only life they have ever known. And, just maybe, it will set them free.