This book is full of references, information, and reasonable conclusions on a subject on which it is extremely difficult to get documentation. Much of Constantine's research is confirmed by other authors who have gone into more detail, such as Anne Collins, In the Sleep Room; John Marks, The Search for the Manchurian Candidate, Kenn Thomas & Jim Keith, The Octopus: Secret Government and the Death of Danny Casolaro; John DeCamp, The Franklin Coverup. Constantine's book may seem farfetched to some people, but there is a growing body of material to back up his assertions.