Omnipotent and ruthless, the Inquisition operates in the shadows to ensure humanity's survival by any means necessary. No price is too high for these imperial agents, and no one can escape the justice of an Inquisitor.

In Throne-Sarcophagus, Inquisitor Erasmus Crowl of the Ordo Hereticus acts as a resolute and vigilant protector, for even the Throne-World is not immune to the predations of its enemies. In the course of his duty to the Emperor, Crowl finds himself drawn into a dark conspiracy.

In The Hollow Mountain, Inquisitor Crowl pursues a perilous and dangerous plot, but his sense of duty compels him to persevere. He and his accomplice Spinoza secretly investigate their leads, fully aware that their every action invites danger.

The Dark City shows us the Throneworld in turmoil, shaken by the opening of the Great Rift and the extinction of the Astronomican. Inquisitor Erasmus Crowl is missing, and with him disappear the clues to the conspiracy that now obsesses him.