Someone is using top-secret information about saucer technology, information that comes from the mysterious top-secret region in Nevada known as Area 51. Meanwhile, Charley takes up flying space planes to the moon for the French lunar base project. There she discovers a madman and a world-threatening antigravity beam… When Charley sees how high the stakes are, she needs the kind of help that only Rip can bring her—by prying his saucer out of the hands of the U.S. Government and hurtling it toward the moon... A furious duel is in the offing between a megalomaniac bent on the conquest of Earth and a handful of runaway heroes. As a plot that reaches back 50 years explodes, a horrific weapon is trained on the Earth’s cities; humankind is dragged to the brink and offered a fearsome choice: surrender or death...