Battle-Captain. Knight Errant. Agentia Primus. Hero. Nathaniel Garro's journey through the Horus Heresy has been long and hard - this is his story. From out of the shadows of the Silent War, a new hero emerges. 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 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, Garro stands as a paragon of loyalty and protector of the innocent, ever ready to strike back at the traitorous allies of the Warmaster. But he is walking a dangerous path of his own, one that may lead him to question his place in the Imperium... and what if he, too, should falter?

Long has been the road of Nathaniel Garro. After escaping the treachery of Isstvan III aboard the Eisenstein, he was gifted with new purpose as the Agentia Primus of the Knights Errant - and yet, Garro has become listless as the full extent of Malcador the Sigillite's plans for the future are revealed, questioning his place in the galaxy once more. Even as the armies of the Warmaster draw near, Garro strikes out into the wastes of holy Terra. The object of his search? None other than the Living Saint, Euphrati Keeler.

Book 54 in the New York Times Bestselling series The Horus Heresy. Discover the last battles leading to the Siege of Terra... 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.

While the war rages on across the galaxy, for many on the Throneworld of Terra it exists only in rumour and hearsay. But in the course of her daily duties, humble adept Katanoh Tallery discovers evidence of a conspiracy within the Administratum - surely, this can only be the precursor to a traitor attack on the Solar System itself! Fleeing into the shadows, she soon finds herself at the mercy of the mysterious Knight Errant Nathaniel Garro. Will this stalwart defender of mankind be her saviour, or her executioner?

After pursuing an insidious genestealer cult across the sector for years, Chapter Master Caedis of the Blood Drinkers stands ready to destroy the original source of the infection - the vast and mysterious space hulk designated Death of Integrity. However, immediately coming into conflict with both their brothers in the Novamarines Chapter and the priesthood of the Adeptus Mechanicus, the Blood Drinkers must reign in their more aggressive instincts and accept the possibility that the hulk itself may be of value to the Imperium.

Book seven in the New York Times bestselling series 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 Heresy begins? Loyalties are put to the test, the cunning schemes of an alien intelligence are revealed, and the fate of mankind hangs in the balance.