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 is roused by a call to the city prison. A prisoner has torn his eyes out and cannot say why. Yet worse: in the sockets that once held his eyes, teeth are growing. The police suspect the supernatural, so Christophor, a member of the king's special inspectorate, is charged with finding the witch responsible. Night-by-night, Christophor's investigation leads him ever further from home, toward a backwards village on the far edge of the kingdom. But the closer he gets to the truth, the more his day-brother's actions frustrate him. Who is Alexsander protecting? What does he not want Christophor to discover? And all the while, an ancient and apocalyptic ritual creeps closer to completion... 'Clever, original and beautifully crafted, half the fun here lies in getting to grips with the ramifications of this complex world, but the story holds like a vice'