The sinister limbo of winter is falling on the Imperial archive world of Mnemosyne. A great fog rolls in, one that will not dissipate for months. With it comes unimaginable hell for the planet’s citizens as the Chaos Space Marines of the Company of Misery stage a brutal invasion. But as the defenders of Mnemosyne fall before the Traitors, something moves in the mist. There are phantoms abroad, warriors of darkness and flame. The Company of Misery is now confronted by the Legion of the Damned, and the terrified scribes of the Librarium find themselves caught in a war between the armies of horror and terror.

Read it because
David Annandale writes horror stories like no other Black Library author, and nothing's better suited to a creepy tale than the ghostly Legion of the Damned...