Speed--and more speed--go into the mammoth project of completing Tom Swift's astounding new moonship, which is to carry Tom and his crew to Earth's barren satellite on invisible beams of force. It is a race against time and the stakes are high: a massive plague has struck the planet of Tom's mysterious space friends, an unknown disease which could threaten life on our world as well. From the first test flight to the day the mighty Challenger soars...