While the war rages on across the galaxy, humble adept Katanoh Tallery discovers evidence of a conspiracy within the Administratum. Fleeing, she finds herself at the mercy of the mysterious Nathaniel Garro.

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It's the end of an era for Garro... and maybe the start of a new chapter. He's gathered Malcador's Knights Errant and now he embarks on a personal quest to discover his role in the wider Horus Heresy - and in doing so he discovers a secret that could change the course of the war.