Warhammer 40,000: Eisenhorn Hereticus

Hunted by his former allies as a radical and a danger to the Imperium, Inquisitor Gregor Eisenhorn must fight to prove that he remains loyal as he tracks down a heretic whom the Inquisition believed dead - the dread former Inquisitor Quixos. As he grows more desperate for victory, Eisenhorn uses ever darker means to achieve his goals - but how far can he go using the weapons of the enemy until he becomes that very enemy - and no different to the traitor he haunts?