From Light to Dark    by Irene L.  Pynn
Price: $0.99 USD. 63600 words. Published on October 30, 2011. .
Eref is about to die. He sits at the End of Light World, accepting his stoning execution one rock at a time, until the impossible happens: the ground opens up beneath him, and he drops down into the unknown. There, he meets Caer, a kind-hearted girl from Dark World who saves his life. Together, the pair forms an unlikely and illegal bond that not even the strongest hatred can break.