This is the 4th novel in the Lunar Saga (that started as a single novel and became a 2-book story then a trilogy and now this!).After making an underground inferno harmless and creating the Moon's first active volcano in millennia, Tom Swift is now trying to help the residents of the former slave colony on the dark side of the lunar surface as they try to build the first off-planet resort. But, there are difficulties that must be overcome.At the same time, Enterprises' head of Security, Harlan Ames, is determined to get to the bottom of one final mystery surrounding the former Masters, and disposing of some evidence he would rather keep hidden. All this takes him, and a civilian archeology team, back to the Himalayas.Unknown to anyone is a young man who has vowed to destroy Tom Swift for some imagined family disaster. He manages to get assigned to the Mood as part of the resort construction team, and sets himself up to kill Tom Swift!