At the end of the twenty-first century, Earth is under the control of a single intelligence, the apparently benign One True. Mars, meanwhile, is slowly terraforming, and the human settlers there are still free of One True's control...but they need a pressure suits to survive outside, and it will be a century or more before the planet's fit for terrestrial life. Terpsichore Murray is growing up on Mars. She wants to quit school and become, like her...