Deliverance Lost

Gav Thorpe's eighteenth Horus Heresy novel follows Corvus Corax, primarch of the Raven Guard, after his Legion is all but destroyed at the Dropsite Massacre. Corax returns to Terra to seek the Emperor's help in rebuilding his warriors, then takes up that work on the Raven Guard's home world of Deliverance, while agents of the Alpha Legion move against him from the shadows.