The Apocalypse Codex (Charles Stross)

Another in the Laundry Files series, which I love for its humor, its intelligence, and its willingness to twist genre boundaries into Moebius strips. Bob Howard is again the narrator, telling how he is threatened with promotion within the more-secret-than-secret British agency charged with protecting England and the world from Lovecraftian horrors that constantly try to breach the boundaries between the worlds and munch on our tasty human souls. In this version, the charismatic leader of a splinter faction of an evangelistic American church is demonstrating a distressingly effective ability to rally the faithful. It turns out that the Second Coming is not quite what they think it is, and Howard and a beautiful, powerful witch named Persephone have to shut them down. If you like humor and horror woven together, you'll love this one.