The Solar System is finally recovering from the Great War - a war that devastated the planets and nearly wiped out the human race - and the population of the outer moons, orbiting Jupiter and Saturn, is growing.

On one of those moons, Alex Ligon, scion of a great interplanetary trading family has developed a wonderfully accurate new population model, and cannot wait until the newly reconstituted "Seine," the interlinked network of computers that spans the planets and moons and asteroids, comes back on line. But when it does, and he extends his perfect model a century into the future, it predicts the complete destruction of the human race.

On another moon, the Search for Extraterrestrial Intelligence goes on, undaunted by generations of failure. And to her amazement, Millie Wu, a young genius newly recruited to the project, has found a signal . . . a signal that is coming from outside the solar system.

And in his new retreat on a minor moon of Saturn, the cranky genius Rustam Battacharyia is still collecting weapons from the Great War. He thinks he may have stumbled on an unexpected new one...but he'll need to disarm it before it destroys the Sun.

About the Author

Charles Sheffield is a mathematician and theoretical physicist by training. His doctoral work was on Einstein's Special Theory of Relativity. Currently Dr. Sheffield works as chief scientist for the Earth Satellite Corporation, a Washington, D.C.–based firm that specializes in the analysis of data gathered from space.

The author of thirty previous science fiction novels, including Cold as Ice and The Ganymede Club from Tor, Sheffield lives in Silver Spring, Maryland, with his wife, author Nancy Kress.

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