Jamie Waterman discovered the cliff dwelling on Mars, and the fact that an intelligent race lived on the red planet sixty-five million years ago, only to be driven into extinction by the crash of a giant meteor. Now the exploration of Mars is itself under threat of extinction, as the ultraconservative New Morality movement gains control of the U.S. government and cuts off all funding for the Mars program.

Meanwhile, Carter Carleton, an anthropologist who was driven from his university post by unproven charges of rape, has started to dig up the remains of a Martian village. Science and politics clash on two worlds as Jamie desperately tries to save the Mars program and uncover who the vanished Martians were.