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 great shape, as you can see: edgewear, page toning, a bit of spread, and some marks to the flyleaves, plus a wee split at the bottom of the front spine. But a fine reading copy if you've never read it.