Picking up fairly recently after the events of Moonrise, the citizens of Moonbase continue to live and operate their colony while fighting (politically and ultimately physically) the forces of the U.N. back on Earth, which is trying desperately to shutdown their base due to their fear of nanotechnology, among other motivations. This is an excellent tale of how the people of Moonbase use their wits and courage to repel the bigger and stronger forces of the U.N. Peacekeeping soldiers to survive and eventually live on their own on the moon as an independent nation. The conclusions of this book ultimately set in motion many of the future tales of Bova's Grand Tour, which makes this book a real critical pivot point in this saga.