Chosen?

A demon named Raven needs her head back to resume her war against heaven,
but Ed doesn't know he has it.

Ed is a Christian archaeologist with a secret: his job has become a nightmare, because, for months, the dead have been coming back to life under his trowel and brush.

What's happening? Is he 'Chosen by God' like some kind of monster-fighting TV hero?
If so, what is he supposed to do? Maybe he's simply insane; no one else ever sees a thing. At least, they don't until the day a colleague borrows Ed's pencil.

Raven wants her head back, and Ed wants his life back, but an angel's request changes everything. The fate of the world - and far more - now rests on Ed's choices and on his faith.

But how can an ordinary man defy a determined demon?