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Having witnessed the terrible massacre of Imperial forces on Isstvan III, Death Guard Captain Garro seizes a ship and sets a course for Terra to warn the Emperor of Horus's treachery. But when the fleeing Eisenstein is damaged by enemy fire, it becomes stranded in the warp – the realm of the Dark Powers. Can Garro and his men survive the depredations of Chaos and get his warning to the Emperor before Horus's plans reach fruition?

After the horrors of Isstvan V, Horus declares outright war against the Imperium. In the shadows of the Emperor's Palace, powerful figures convene.Their plan is to send a team of assassins to execute the arch-traitor Horus and end the war for the galaxy of mankind before it's even begun. But what they cannot know is that another assassin is abroad already, with his sights firmly set on killing the Emperor.

Since the earliest days of the Great Crusade, Sanguinius – angelic primarch of the IXth Legion – was ever among the closest and most loyal of Horus’s brothers. But the Blood Angels have long kept their true nature hidden from the rest of the Imperium, and when the Warmaster hints that the key to their salvation may lie in the ruins of a conquered world, the sons of Sanguinius race to claim it. Now, as the revelation of their betrayal dawns and the traitors’ hand is revealed, the Blood Angels must face all the warp-spawned armies of Chaos, as well their own personal daemons, upon the blasted plains of Signus Prime…

Battle-Captain Garro, a legendary hero of the Horus Heresy, finally emerges from the shadows.

Clad all in grey, an errant warrior of the Legiones Astartes kneels before the Regent of Terra and accepts a solemn new duty--Battle-Captain Nathaniel Garro, once commander of the Eisenstein, is now Agentia Primus of Malcador the Sigillite. From the desolation of Isstvan to the halls of the Imperial Palace itself, he stands ready to strike back at the traitorous allies of the Warmaster. But Garro is walking a path of his own, one that may lead him to question his true place in the Imperium - and what if he, too, should falter?

This book contains James Swallow's complete saga of Nathaniel Garro in the Horus Heresy--it contains the original series of audio dramas, expanded with additional scenes to better represent the author's original vision, along with the the novella Vow of Faith.

The skies darken over Terra as the final battle for the Throne looms ever closer... As the Traitor primarchs muster to the Warmaster's banner, it is Mortarion who is sent ahead as the vanguard of the Traitor forces. But as he and his warriors make way, they become lost in the warp and stricken by a terrible plague. Once thought of as unbreakable, the legendary Death Guard are brought to their knees. To save his Legion, Mortarion must strike a most terrible bargain that will damn his sons for eternity.

Meanwhile, in the cloisters of Holy Terra, a plot is afoot to create sedition and carnage in advance of the Horus's armies. Taking matters into his own hands, Malcador the Sigillite seeks to put a stop to any insurrection but discovers a plot that he will need all of his cunning and battle-craft to overcome.