In a world of 'normals', it is hard for others to survive. They are burned at the stake, chased down, drowned, and many other horrid things. They are outcasts; rejects. No one seems to care about them. Thats how they end up here, in Teelu.
After studying the Humans for a while, the Angels and Demons watching them visit Earth and try to blend in. Will the Humans remain unaware? Or will they find out that there are more than one species that resemble humans?