But immortality isn’t safe. Minerva and Raven’s life-giving powers mysteriously fade, forcing them to take refuge in The Between, a shadowy realm of memories that lies between life and death. What's more, their old adversary Jules is on the loose, partnered with a resurrected Nazi scientist planning a monstrous experiment that will change the destiny of the human race. And now it's up to a 21-year-old dead girl to save the world—again.