After reading this book, it is clear that the author Nicolas Redfern has spent a lot of time doing research for it by taking eyewitness accounts, riffling through documents recently declassified as part of various countries' Freedom of Information laws and subsequently writing this book. That is as far as this publication can be commended.
The problem with this book is that it neither satisfies the skeptic or the believer.
The book makes claims of mainly UK military and government involvement in the recovery of crashed or landed UFOs - however, nothing is substantiated here. The author uncovers vague government documents that don't prove anything. The first hand witnesses don't have any evidence to speak of besides their accounts. The strongest "evidence" is usually pure speculation of why the military apparently lied about events. Often the best or most interesting sources of information are hearsay (second-hand interviews from someone else). If you look at the photos in the middle of the book, you don't see anything of importance or proof. There are no photos of scorched landing marks, no pictures of unknown metallic objects and not even a blurry photo of something in the sky.
As far as caterring for the believer, the accounts are very superficial - for whatever reason - and only go so far as accusations about where the crashed UFOs and alien bodies are kept. We don't learn anything new about these aliens or their reason for being here. Subsequently, the accounts are boring, unexciting and unenlightening.
The first chapter are allegations that one of the reasons Marilyn Monroe and JFK were murdered was their desire to spill the beans on the UFO phenomenon. The substantial lack of proof in this chapter sets the tone for the rest of the book.
Overall, I was bored by the lack of depth to the extent of the alleged events disclosed by the author and disgusted by what the author considers quality journalism.