Good concept, and a very interesting scientific angle, but reads like a drawn-out comic book. The plot was poorly developed, never straying from the pattern of getting into a jam, getting out, killing some medievals, repeat. There was just no depth.After reading half the book, I was very disappointed and only finished it in order to give this review some validity, while hoping in vain for some sort of plot twist. My poor wife heard me whine all the way through.I read Terminal Man, Andromeda Strain, Great Train Robbery and Jurassic Park and found them excellent. This book is definitely coasting on reputation or written as a movie script.