I am not a Kennedy assassination expert by any means. I might go so far as to call myself an enthusiast, but there are many others far better equipped to judge the accuracy and veracity of Posner's book. This isn't a primary source for the material, but that's not what I was looking for. What this is, as far as I can tell, is a well-written, well-cited, competently argued account of the assassination that feels objective and accurate. There are plenty who disagree with Posner's account, but I found the book very enjoyable, which is all that mattered to me.