Chariots of Heaven (Chariots of Heaven Saga) (Volume 1)

The first installment in the story of ancient Gods who come to earth in search of precious resources, but instead find ghosts from their own past. Most surprisingly, these ghosts take the form of two human girls, Kira and her younger sister Kaya. Discovering that the sisters possess rare abilities, the alien deities decide to take the girls to their home planet Tython to learn more about them. Little do they know that the discovery of humans will shake the very foundations of their galactic kingdom…