In Beyond Top Secret, British researcher Timothy Good has written a thorough overview of many of the main cases in the controversial area of UFO study. In a subject that attracts more than its fair share of tin-foil hat wearing cranks, Timothy Good has done the subject a service by providing a careful, country by country examination of the most prominent cases since the Second World War. In doing so, he demonstrates that no, UFOs don't only appear in small dusty towns of the American south; this book provides a global perspective. As well as this, the book takes a look at certain institutions that have demonstrated an interest in the subject, such as the Central Intelligence Agency, amongst others.
Whilst, for obvious reasons, the subject of UFOs brings out of the woodwork many fantasists and hoaxers, Timothy Good shows that not all of the witnesses to these strange events can be so easily dismissed as time-wasters. Over the years, there have been many credible witnesses who have provided compelling testimony, including a U.S. president (Jimmy Carter, who promised that when he became president, he would declassify all files pertaining to UFOs; he didn't). There are many who would argue that eye-witness testimony alone is not enough to certify such a momentous subject, that an incredible claim requires incredible evidence. It is perhaps wise to remember that if we disregard such testimony too hastily, we not only diminish the value of human experience, we not only have to question numerous criminal convictions based purely on exactly the same kind of evidence but we also have to throw out the world's major religions, based as they are, not on physical evidence but on - yes - human, eye-witness testimony.
Timothy Good keeps things serious and seriously grounded. He covers dozens of incidents, including the infamous Roswell incident (of course) and analysis of the Majic documents (and the MJ12 working group), as well as the Rendlehsam Forest case. However, Good also throws light on many smaller cases that may well prove just as informative. Good also lays out governmental interest in UFOs, from both the U.S. and the U.K. This interest has been from both individuals such as Jimmy Carter (mentioned above) and Winston Churchill, amonst others, to intelligence collecting agencies and governmental studies.
If you think the UFO subject does not have a shred of credibility and have never read a serious book on the subject and if you are only going to ever read one book on the subject, then read and consider this one.