Hitomi's Path by M. L. Buchman

Five hundred years ago, Japan hid itself from the rest of the world. Rather than technology, they discovered power. The emperor still rules, but the mystics hold sway.

Hitomi is the youngest warrior in the history of the fighting Mura clan, who have evolved from the rough beginnings as the Ninja into the race’s supreme weapons.

But Hitomi stumbles upon a secret, one so vast that even the emperor may not see where it leads. Unless he too seeks to bury the secret along Hitomi’s Path.