The Emperors Knife: Tower and Knife 2

There is a cancer at the heart of the mighty Cerani Empire: a plague that marks each victim with a fragment of a greater design. Geometric patterns spread across the skin, until the victim dies in agony or becomes a Carrier, doing the bidding of an evil intelligence.

The lost prince Sarmin, the emperor's only surviving brother, lies locked in a hidden room. As the pattern draws closer to the palace he is at last remembered: now he awaits a bride, Mesema, a Windreader from the northern plains...