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…