Five hundred years ago, Oleris III was ravaged by a Chaos plague. Now it is a world of tombs and catacombs. It belongs to the dead. Colonel Graven and his 401st Krieg Regiment are charged with searching for a missing inquisitor in the bone-filled ossuary tunnels beneath the planet. But the dead are stirring, and down in the labyrinthine darkness, his kill team comes face to face with unspeakable horrors.