Co-written with Neil Gaiman and a furiously funny read. Take the movie "The Omen" and apply the dryest wit to it and you come somewhat near to describing the story. Except that description doesn't take into account the partnership of a demon and a devil, the appearance of Tibetan Lamas, spaceships, the Four Motorcyclists of the Apocalypse, the Other Four Motorcyclists of the Apocolypse or Sister Mary Loquacious (of the Order of Chattering Beryl).
There have been reports for a while now that Terry Gilliam will direct a movie version of this story. Those reports have subsided since that colossal ripoff "Dogma" hit the screens.