Ghost in the Forge - The Ghosts, #6

Caina Amalas is a Ghost nightfigher, a spy and agent of the Emperor, and time and time again she has overcome mighty foes through boldness and cunning. But even her boldness might not be enough to stop the coming destruction. A secretive cabal of sorcerers has created a weapon so powerful that its wielder will have dominion over the entire world - and the weapon is for sale to the highest bidder. Unless Caina unravels the sorcerers' secrets, uncounted millions will perish in the weapon's wrath.
Starting with her...