The Imperium has never before been in such dire straits - an Ork assault moon hangs over Terra and xenos armadas are devastating the part of space occupied by humanity. It seems that nothing will stop the greenskins: neither brute force, nor science, nor faith. When the Adeptus Mechanicus report that they have discovered the Ork's origin, the Space Marines muster their forces for a great march on the enemy's homeworld. But the forces of the Imperium need a leader, a hero from legend who can lead them - a primarch. Is it possible to find such a hero - let alone convince him to come to the rescue? The collection includes novels: Guy Haley's "Throne World", David Guymer's "Echoes of the Long War", David Annandale's "Hunting Vulcan", Gav Thorpe's "The Beast Must Die".