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Mark Johnson, a young executive in the great Tyson financial empire, is charged with an unusual and dangerous assignment--to bring peace to one planet and discord to another, to save both civilizations from destruction.
Mass Market Paperback, 246 pages
Published February 12th 1988 by Del Rey
(first published 1988)
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Tesseract (1988) perhaps over-complexly explores various dimensions in Time and space, the eponymous AI serving to help the protagonist of the tale decide which Alternate World available to him will offer a chance for Homo sapiens (plus another race) to avoid mortal Disaster.