After twenty-five hard, blood-soaked years, Warmaster Macaroth’s crusade to free the Sabbat Worlds from the clutch of Chaos has ground to a halt. The Warmaster’s forces are split and deadlocked on two separate fronts, haemorrhaging momentum, men and materiel. A series of ambitious covert operations is planned across the sector – their aim to break the stalemate so the Imperial forces can move forward once more. Key players in this shadow war are Colonel-Commissar Gaunt and the Tanith First-and-Only. Will the bravery and cunning of this infamous regiment tip the balance in the Imperium’s favour?