This is an early entry in Bova's Grand Tour, and one of the better ones at that. Paul and Joanna Stavenger are desperately trying to keep their vision of colonizing the moon alive while many on Earth (as well as members of their own family) are doing their best to sabotage this mission. Bova again mixes drama with hardcore science fiction to create a suspenseful story about the future of mankind's exploration of the moon as well as the solar system. I really enjoyed this one.