Unnervingly, Hale doesn't fit the bill of a killer. The first-person narrative that centers this novel reveals an acerbic young atheist, newly enrolled at the University of Edinburgh to carry on the legacy of his recently deceased father. In need of cash, he takes a job ghostwriting a mysterious book for a dark stranger, but has misgivings when the project begins to reawaken his satanophobia, a rare condition that causes him to live in terror that the Devil is after him. As he struggles to disentangle fact from fear, Grayson's world is turned upside down after events force him to confront his growing suspicion that he's working for the one he has feared all this time -- and that the book is only the beginning of their partnership.