A band of immortals recruit physicist Sequoya Guess — who gains control of Extro, the super-computer that controls all mechanical activity on Earth. But the task of the merry suddenly becomes a fight for the future of Earth. Sequoya Guess must be killed. And how do you kill an immortal?
Serialized in (Nov, Dec 1974, Jan 1975) as , later published in book form as . Several later editions were issued under the title .
Nominated for Nebula Award for Best Novel in 1975.
Nominated for Hugo Award for Best Novel in 1976.
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