Ten thousand men and women, exiled from Earth, are riding a man made habitat to the planet Saturn. They form a volatile community - one that needs only a spark to set off an explosion that could end in disaster. Some are innocents like Holly Lane; revived alter dying many years ago from cancer, or Manuel Gae a stunt man who intends to land on the surface of Saturn's biggest moon, Titan. Others are idealists, like Edouard Urbain, the habitat's chief scientist, opposed to allowing any human to set foot on Titan. And some have much more dangerous plans. Malcolm Eberly, a swindler who was freed from prison by agents of the Holy Disciples, has been placed aboard, the Saturn-bound habitat to take over its government. Once again, Ben Bova has brought the future to thrilling, dangerous life in a story that weaves together scientific fact and an unputdownable story.