The Carcharodons are a Space Marine Chapter unlike any other. Get a window into their inner workings as they navigate a protracted war and their relationship with Adeptus Mechanicus allies. In the cold dark between distant stars, the Carcharodon Astra hunt. These Space Marines are the Imperium's exiled protectors, merciless predators who prey on the enemies of mankind at the edges of the galaxy. Yet there are times when they must set aside their insular practices and come in from the depths, a duty that Bail Sharr and the Carcharodon's Third Company must now fulfil. The isolated forge world of Diamantus faces a threat of apocalyptic proportions: a warped and mutated space hulk infested by the forces of Chaos, commanded by the monstrous datagnost Voldire, disciple of the dread demigod Vashtorr the Arkifane. As the battle-weary Carcharodons make their stand alongside the Adeptus Mechanicus, horrors and nightmares raining down around them, the Space Marines must confront their place within this new Imperium, and destroy the hulk before Diamantus is lost.