Commissar Sebastian Yarrick returns to action to defend the world of Armageddon. When the largest ork horde seen for centuries hits the hive world, the Imperial forces are faced with an overwhelming attack. As battle rages across the planet, Yarrick and his allies lead the defence, striking at the orks in a series of daring assaults. Even if it means incurring the wrath of Armageddon's corrupt Overlord, Commissar Yarrick will not let Armageddon fall.