From out of the shadows of the Silent War, a 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, now Agentia Primus of Malcador the Sigillite.

From the desolation of Isstvan to the halls of the Imperial Palace itself, he stands as a paragon of loyalty and protector of the innocent, ever 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 own place in the Imperium...and what if he, too, should falter?

This audiobook contains James Swallow's complete saga of Nathaniel Garro in the Horus Heresy - the audio drama series is embellished and expanded in prose, with additional scenes to represent the author's original vision. This all serves as prelude to the events of the novella Vow of Faith, bringing Garro closer to his inescapable destiny as the first true martyr of the Lectitio Divinitatus.