Xenos (Eisenhorn, #1)

The Inquisition moves amongst mankind like an avenging shadow, striking down the enemies of humanity with complete ruthlessness. Inquisitor Eisenhorn faces a vast interstellar cabal and the dark power of daemons, all racing to recover an arcane text of supreme and abominable power - an ancient tome known as the Necroteuch. Book I in the Eisenhorn trilogy sets a new standard in action and adventure.