Silver Light: Book 1 of Mothertree

Walde has inherited a forbidden power from his father enabling him to commune with Thara an enigmatic being that lives deep in the earth. Walde thinks he can keep this power a secret but one day he slips. His father is blamed and executed the body placed on a raft and sent down a rushing river. Walde breaks free and goes after him...only to discover that the execution was staged. Very much alive his father floats off to a mysterious end. During Waldes perilous journey to rescue him he learns what is truly at stake: not only his father but also his peoples entire way of life.