Limbo is an isolated colony of child-vampires ranging from 4 to 120 years old, all having been victims of 'shameless' adult vampires. They are led by a formidable and deeply religious ex-nurse whose destiny in life is to find these "lost souls" and bring them of age to her colony. Through teaching, religious rituals adapted from the Catholic faith, and the occasional visit to local towns for blood, he is preparing them for what God had in mind for them: the replacement of the old common human and 'deeply sinful'. ', and the creation of a new race of men through "natural cloning", or in more lay terms, their infection by their children. But they are not the only colony of this type in the world, nor are they as "separated" from external threats as they are believed to be.