Alexandria

"One thousand years from now, a small religious community lives in what were once the fens of eastern England. They are perhaps the world’s last human survivors. Now they find themselves stalked by a force that draws ever closer, and that seems to have brought them to the brink of extinction. A force that offers them a promise and a threat: a place called Alexandria. Set in a time on the far side of an apocalypse, and perhaps on the verge of another, Alexandria is the final novel in my Buckmaster trilogy, which maps two thousand years of human history." -- From author's website.