It is a pretty stunning look into the recklessness of Garrison as it details the almost weekly absurd claims that he made as to who was behind the assassination. I didn't learn much of anything new but it's remarkable reading the book how easily Garrison jumped from claim to claim. She has a section near the end where she chronicles the wild theories that he put forth. It's interesting that in all of his claims Garrison never once connected organized crime to the murder. Pretty interesting.
And if I recall correctly she believed there was a conspiracy behind the assassination of JFK and that the mob was involved. So she wasn't a lone assassin believer (Lambert died I believe either this year or last year).
As to the Shaw matter: This never made a lick of sense to me. Garrison's claim was that Shaw, Ferrie and Oswald first planned the assassination at a party that they attended. Apparently they discussed it openly with all sorts of people around them. No they wouldn't. Then somehow these three individuals got major elements of the CIA to go along with their scheme. No they wouldn't either. Then after pulling this all off Shaw calls an attorney (Dean Andrews) and requests that he defend Oswald. No he wouldn't.
Patricia Lambert sets the record straight by citing what really happened and backing up her accounts with proper documentation.
Garrison is exposed for what he really was. Here is a passage that I have to agree with (after reading her book):
...Shaw was acquitted. But Garrison launched a new offensive. Judge Christenberry ended the game and convicted Garrison. But Garrison turned to his typewriter and reinterpreted his fall. Examining the real record of Jim Garrison’s investigation is like viewing up close the mangled wreckage of a high-speed car crash. In his book, Garrison reshaped that wreckage into a brand new vehicle, the latest model, irresistible, gleaming on the showroom floor. Oliver Stone climbed in and drove it home.