After her escape from the Tower and from her father's experiments, Kat Bloodmayne wakes up to discover the dark power inside of her has grown stronger. Now more than ever she needs to find the doctor who holds the key to healing her, but the only one who can help her find him is Stephen Grey, the very man who betrayed her.

Stephen Grey cannot change the past or what he did to Kat, but he will do everything he can to help her now. But will Kat let him? Or will his transgression be too much to overcome?

Time races against them as they travel with sky pirates through harrowing storms and across the war-torn country of Austrium in search of the doctor who can cure Kat. But can he cure what is broken inside of her? Or will the monster inside of Kat consume her soul?