Into the Abyss — Charles Martin

Two years after waking up in the tiny village of Great Oak with no memory of where he came from or how he got there, Ishmael sets out into the world to find his answers. But with no clues to guide him, the road is ahead seems to be as murky as the one that brought him to Great Oak.
And who (or, indeed, what) is the man who calls himself the Keeper?