Treasure Hunt - The Two Moons of Rehnor, #9

In book 9 of the Two Moons of Rehnor series, a spaceplane has crashed on Lyra II, an undeveloped Mesozoic stage planet. All adults aboard are dead, leaving only ten year old Sara to survive alone. Meanwhile, something strange is happening even further out in the galaxy where a young man is kidnapped by a Space Cowboy. On top of that, the Palace of Mishnah is in a state of upheaval as formerly loyal Retainers scheme for control of the throne.
The Imperial SpaceNavy must race to the rescue of both Sara and the young man while searching for a missing treasure which holds the key to solving the crisis at the Palace.