Child psychiatrist Hannah Cohen thought she could handle difficult cases. But medical school never prepared her for Elena. Nor the demon that's possessing her. Hannah finds a way to rid Elena of her demon, but not without a price.

Years later, Hannah has grown comfortable exorcising the demons of her patients. Until she meets Lucas. Whatever is inside of Lucas is far more powerful than anything she has faced. The denizens of Hell are angry with Hannah. And they sent one of their leaders to destroy her.