Thrice Upon a Time

James P. Hogan

first published 1980 Del Rey, 1982 paperback

When Murdoch was summoned to his grandfather's isolated Scottish castle, he had no idea of the old man's latest discovery -- nor where it would lead him. Sir Charles, a genius in far-out physics, had found a flew in the law of conservation of energy; in any process, an incredibly tiny increment of energy escaped -- back through time! Using this "tau" radiation, he could send messages into the past. But Murdoch discov...

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Editions we hold

Thrice Upon A Time paperback · 2000 · Baen · 416 pages · 9780671319489
Thrice Upon a Time paperback · 1989 · Del Rey Books · 9780345009807
Thrice Upon a Time paperback · 1984 · Del Rey · 9780345323866
Thrice upon a Time paperback · 1982 · Del Rey · 9780345308863
Thrice upon a time edition · 1980 · Ballantine Books · 311 pages

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