Black Stones of Ter Chadain by C.S. Yelle
Approx. 103,440 words.
Published on August 22, 2013 by
A-Argus Better Book Publishers.
Second book in the paranormal romance series, Protector of Ter Chadain Series. Twin brother and sister discover that each is a Protector, endowed with supernatural powers, something that has never happened in history.