Something lives deep beneath the streets of San Francsico. Something that has been there for centuries, something that comes out at night ... to feed on the dregs of society. A sub-culture, with its own myths, its own legends of leader named The King that will lead them out of bondage, and their own demon, a hunting shadow known only as Savior.
But the legends of Savior's brutality have faded, the fear passed into stories told to frighten the young ones. When The King finally appears, just as foretold, the Nocturnals know their time has time -- the time to come out from under the streets and hunt humanity in the open.