I read the manuscript before designing/illustrating the dust jacket. It is a VERY well-written book with lots of technical aspects with an unusual but convincing story. I was surprised that a DOCTOR was the author. I equated it to TOM CLANCY military thrillers and was SURE that someday it would become a movie. (As a matter of fact, much of the first chapters were "leaned heavily upon" for one major movie). Dr. Casto has written several fascinating sci-fi books worth reading.