"Here is a sea story of an imaginary war that somes very close to matching - in suspense, action and physchic strain - any chronicle of real war by C. S. Forester or Herman Wouk... In this fine blend of speculation and action, Mr. Herbert has created a novel that ranks with the best of modern science fiction." - The New York Times
"It's a spy story, a chase thriller, and a psychological mystery rolled into one, with solid characterization and something to say about the tensions of cold war. It's one of the few science fiction novels I'll recommend to anyone." - Pittsburgh Press
"This is a fictional story of the future that we should pray will never become a new story of the present." - The Stringfield Daily News