Book excerpt: "Christophor Morden lives by night. His day-brother, Alexsander, knows only the sun. They are two souls in a single body, in a world where identities change with the rising and setting of the sun. Night-brother or day-sister, one never sees the light, the other knows nothing of the night. Early one evening, Christophor, a member of the king's special inspectorate, is called to the city prison. Inexplicably, a prisoner has torn his eyes out; yet worse, teeth are growing in their sockets. The police suspect the supernatural, so Christophor is charged with finding the witch responsible. Night-by-night, Christophor's investigation leads him every further from home. But the closer he gets to the truth, the more his day-brother's actions frustrate him. What is Alexsander hiding? And who is he protecting? All the while, an ancient and apocalyptic ritual creeps closer to completion."--Back cover.