The Grey Knights are servants of the Ordo Malleus, imperious, incorruptible warriors, whose very purpose is to seek out and destroy the most dangerous foes that humanity will ever face; daemons. Armed and armoured with the trappings of a daemonhunter, these stalwart Adeptus Astartes bring death and destruction to the immortal denizens of the warp. Girded by faith, wielders of the nemesis force halberd, the Grey Knights step where others will not tread. Theirs is the hardest task, risking their immortal souls in pursuit of the hungry entities of Chaos, the Imperium's arch foes. Without the Grey Knights, humanity would be but a feast on the sacrificial altar of darkness...

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It's a trio of linked tales that tell the story of Justicar Alaric, a Grey Knight who is tested in the worst ways and faces terrible enemies in service to the Emperor.