By Robert Sam Anson. "The Search For The Murderers Of John F. Kennedy." "What this book seeks to do, on the basis of the evidence available now [i.e., as of publication in 1975] is to establish: that there was a conspiracy" including "links to the intelligence community," an Oswald lookalike, etc. Anson, an underrated genre reporter, may have tipped into crackpottery with this book...
...but you're not a crackpot for wanting to read this vintage PB. It has a cracked spine and toned pages, and what looks like some beach/pool water damage inside, plus a couple of little notes on the inside of the front cover. But it sits pretty straight, perfectly readable.