The Devil's Evidence - Simon Kurt Unsworth

Thomas Fool is a detective from Hell--literally. Having survived the wrath of both angel and demon, and still without memory of his life on earth, Fool is currently spending his damnation as a bureaucrat heading up the Information Office of Hell. But when mysterious fires begin spooking higher-ups in the Bureaucracy--homicidal arson, it's believed--and a series of unexplained murders plagues Heaven, Fool is dispatched north to investigate.

But Heaven is not what Fool imagines. In fact, it's not so different from Hell. And friction between the two afterworlds is only beginning to mount as Fool conducts his investigation. The Devil's Evidence is a thrilling ride through the spiritual realm, and a welcome return for the dead's most endearing private eye.