In Book 4 of the series The Two Moons of Rehnor, Senya returns to Rehnor to take over the throne. In the meantime, Katie is completing her final mission in space. When her contract ends, she must join Senya and fulfill the role that he has intended for her to do. A family emergency on Earth requires Katie to return home and despite Senya's warnings, she leaves Rehnor to return to the Alliance, one last time.