Everyone is not as they seem in this fantasy novel, replete with war, witchcraft and secrets.

Christophor Morden lives in a world where everybody changes with the rising and setting of the sun. For every person contains two distinct identities - a day brother and a night brother. One never sees the light, the other nothing of night.

One evening Christophor, one of the king's special unit of witch hunters, is woken early by a call to the city prison. A young woman has torn her own eyes out, and the police suspect supernatural causes. The investigation takes Christophor far from home, to a village on the edge of the kingdom.

There he will find his witch - and his night brother will find himself desperate to save her. And as this battle of the self rages, the witch's ancient and apocalyptic ritual comes ever closer to completion...