Jennifer Ealey 
The Green-Eyed Man [EPUB ebook] 

Stefan, one of the King’s arms masters, is appointed to train and protect Sasha, the ten-year-old usurped Queen of Kimora. His green eyes are a color never seen among the people of Carrador.
This alone is enough to bring High Lord Tarkyn, forest guardian and sorcerer from the neighboring country of Eskuzor, to investigate. What he discovers turns Stefan’s world upside down.
But soon, all other considerations are thrust aside when Sasha and her pale-eyed friend, Jayhan, are abducted by the Kimorans, intent on forcing Sasha to relinquish her amulet and her rightful claim to the throne.
Racing against time, can Stefan save the two and bring peace to the realm?