The Imperium's attempts to defeat the ork menace seem doomed to failure; it is only a matter of time before the greenskins triumph, and mankind is wiped from the face of the galaxy. Yet there is some cause for hope – the psychic weakness of the orks has been discovered, and a few Sisters of Silence yet survive. Supported by the full military might and technology of the Adeptus Mechanicus, the Space Marines head to the orks' home world one final time. This time there will be no retreat, no surrender. They must succeed... or die in the attempt.