By Gerald Posner. Very well-regarded overview of the case and probably the most trustworthy argument for the "single shooter"/Oswald-acted-alone party. Extremely well blurbed and for good reason.
This burly paperback isn't in perfect shape, as you can see: edgewear, page toning, a bit of waviness from storage, inscribed to a previous owner (not by the author) who also left a stamp — but unmarked inside AFAICS. A fine reading copy.