The stunning third arc from the ongoing Warhammer 40,000 series is collected! Inquisitor Sabbathiel thinks she has all the pieces to unveil the heresy of the Dark Angels Space Marines to the universe - she knows their dark secret, and about the existence of The Fallen. However the Dark Angels aren't about to let themselves be wiped out without a fight. As the Forces of Chaos laugh, brother prepares to war against brother.