Captain Darnath Lysander, hero of the Imperial Fists and captain of their elite First Company, leads his battle-brothers in an assault on a daemon world. Beset by unimaginable horrors and tortured by memories of his time imprisoned by the dark forces of the Iron Warriors, Lysander must rally his Space Marines to defeat the master of the daemonic hordes before they are consumed - or corrupted - by the insidious powers of Chaos.