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After thousands of years of expansion and conquest, the human Imperium is at its height. His dream for humanity accomplished, the Emperor hands over the reins of power to his Warmaster, Horus, and heads back to Terra. But is Horus strong enough to control his fellow commanders and continue the Emperor's grand design, or will such incredible power corrupt him?

A Great War is coming, and it will engulf the Imperium of Man. The Space Marines of the Alpha Legion, the last and most secretive of all the Astartes brotherhoods, arrive on a heathen world to support the Imperial Army in a pacification campaign against strange and uncanny forces. But what drives the Alpha Legion? Can they be trusted, and what side will they choose when the Great War begins?

Loyalties are put to the test, and the cunning schemes of an alien intelligence revealed in this latest instalment of the ground-breaking SF series by Dan Abnett, as the fate of mankind hangs in the balance.

The Emperor is enraged. Primarch Magnus the Red of the Thousand Sons Legion has made a terrible mistake that endangers the very safety of Terra. With no other choice, the Emperor charges Leman Russ, Primarch of the Space Wolves, with the apprehension of his brother from the Thousand Sons home world of Prospero.

This planet of sorcerers will not be easy to overcome, but Russ and his Space Wolves are not easily deterred. With wrath in his heart, Russ is determined to bring Magnus to justice and bring about the fall of Prospero.

Unaware of the wider Heresy and following the Warmaster's increasingly cryptic orders, Roboute Guilliman returns to Ultramar to muster his Legion for war against the orks massing in the Veridian system. Without warning, their supposed allies in the Word Bearers Legion launch a devastating invasion of Calth, scattering the Ultramarines fleet and slaughtering all who stand in their way. This confirms the worst scenario Guilliman can imagine – Lorgar means to settle their bitter rivalry once and for all. As the traitors summon foul daemonic hosts and all the forces of Chaos, the Ultramarines are drawn into a grim and deadly struggle in which neither side can prevail.

Believing Terra has already fallen to the Warmaster, Primarch Roboute Guilliman founds the Imperium Secundus.

The unthinkable has happened – Terra has fallen to the traitor forces of Warmaster Horus! Nothing else could explain the sudden disappearance of the Astronomican’s guiding light at the heart of the Imperium, or so Roboute Guilliman would believe. Ever the pragmatist, he has drawn all his forces to Ultramar and begun construction of the new empire known as Imperium Secundus. Even with many of his primarch brothers at his side, he still faces war from without and intrigue from within – with the best of intentions, were the full truth to be known it would likely damn them all as traitors for all eternity.

As the traitors tighten their grip on Terra, Rogal Dorn must marshal the Imperial hosts to weather the storm. But not all of the defenders will survive the onslaught…

The Traitor Host of Horus Lupercal tightens its iron grip on the Palace of Terra, and one by one the walls and bastions begin to crumple and collapse. Rogal Dorn, Praetorian of Terra, redoubles his efforts to keep the relentless enemy at bay, but his forces are vastly outnumbered and hopelessly outgunned. Dorn simply cannot defend everything. Any chance of survival now requires sacrifice, but what battles dare he lose so that others can be won? Is there one tactical stroke, one crucial combat, that could turn the tide forever and win the war outright?