Descendants of the Earth - The Harmony Saga, #1

Owen is a boy who realizes he is special- he can control fire. Then he finds a camp where everyone is like him. When the Master of the Elements is killed, Owen is sure that he is going to be next in line. All he has to do is help his friends find the Rings of Power. With his new friends by his side, he knows they will succeed. But when one of his allies turns out to be a traitor, he no longer knows what to believe.
And though he thinks he knows what he wants, by the end of his journey, he's not so sure.