The dark oblivion of winter falls on the imperial archive world Mnemosyne. A canopy of fog thickens, which will not lift for months, and with it an unimaginable hell descends on the inhabitants of the planet - a brutal invasion of the Chaos Space Marines from the Company of Suffering. But after the defenders of Mnemosyne die in battles with the traitors, something appears in the fog. Ghosts, warriors of darkness and flame, roam the streets. Now the Company of Suffering faces the Legion of the Damned, and the terrified scribes of the Grand Librarian find themselves trapped on the battlefield between the armies of terror and fear.