In the city of Queen Mab, the dedicated agents of the Holy Inquisition battle with their shadowy counterparts, the infamous Cognitae, to discover the encrypted identity of the enigmatic, all-powerful King in Yellow.
Caught at the heart of this struggle is the pariah Alizebeth Bequin. Where will he loyalties lie? Even if she chooses the Emperor’s foremost agents, will she place her trust in the wise but ruthless Ravenor, or his rival, the denounced heretic Eisenhorn?
The beloved characters of Eisenhorn and Ravenor return, as implacable adversaries in a novel of esoteric mystery.