The hunt is on for the inquisitor, Bronislaw Czevak. Escaping from the Black Library of the Eldar, Czevak steals the Atlas of the Underworld, a living map of the web of paths. With this legendary artifact and his incredible intelligence, Czevak throws off the scent of the predatory Harlequins sent to capture him, and destroys the plans of his enemies from the Inquisition, who wanted him dead. But Chevak’s main enemy is Ahriman, the archmage of the Thousand Sons. He wants to take possession of the knowledge of the Black Library, knowledge that can elevate him to the level of a deity, and therefore wants to destroy the inquisitor who stands in the way. In a desperate pursuit that bends the fabric of reality, Czevak's only hope of salvation is to outwit the chosen one of Tzeentch, the Lord of Chaos and the Architect of Doom. The cost of failure for the Empire is simply unimaginable, which means there is no turning back.