*17th* book in the Wine of the Gods Universe.
Dimensional travel had brought the Earth immense wealth, but also a cross-dimensional war with the Empire of the One.
Jaime Felis had been recruited by the United Earth Central Intelligence Agency and emplaced in the Army unit crossing the dimensions to a world that claimed to have magic. Magic created through genetic engineering, very like the genetic engineering of the One - and of Jaime's home planet. They hoped that his faint abilities would give them some insights into the magic of both this low tech Comet Fall and the high tech Empire.
He hadn't expected to be marooned. Nor for rescue to be so fraught with problems.
Genre: Science Fiction
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Used availability for Pam Uphoff's Earth Gate