The Tau of the Canis Salient have long been a thorn in the side of the Imperium, but their ambition knows no bounds. Brazenly, they have attacked Watch-Station Antael, an in-construction outpost of the Deathwatch in the Jericho Reach, and laid siege; a strike team is being assembled by the Watch-Captain de Dominova to purge these aliens from holy ground, and reclaim the honor of the Adeptus Astartes and the Inquisition. Yet, Astropath and Librarian alike have had strange dreams and seen ominous portents as of late, as though something far more sinister lurks just beyond the horizon...