When the Imperial shrine world of Kathur is blighted by Chaos, the brave Guardsmen of Cadia are sent to reclaim it. The plague of Nurgle has set in deeply on the planet, forcing the Cadians into battle with an innumerable legion of the infected. In the midst of battle, Captain Parmenion Thade is thrust into an unlikely commanding role. Yet, he cannot imagine what lies ahead on Kathur, and just how important it will be to ensure victory there.