I know that more than a few psychologists and psychiatrists have made a forensic diagnosis of PTSD of Jackie O, and a few writers have discussed it in brief, but, to the best of my knowledge, this is the first book-length treatment of the idea, and a very good one.
The book focuses on the period from Jack's death to Bobby's, with some treatment of her marriage to Aristotle Onassis, then a brief wrap-up, and her childhood in front.
Several takeaways, related to but not limited to, the PTSD angle:
1. Her biological father, Black Jack Bouvier, was just as much a philanderer as JFK, and she knew it, by the time of prep school, even asking him if he'd bedded any of her classmates' moms. So, per the old adage about marriage, that men marry expecting their wives to stay the same and women marry expecting to change their husbands, with a dash of quasi-Freudian thought, did she marry Jack, subconsciously, if not consciously, hoping to "tame" him?
2. "Death of a President" author William Manchester apparently had PTSD himself, tho the term was not used at the time, from his WWII experience at Okinawa. (His military medical file mentions "scars on his brain" or similar, per the author.) He had not worked through it until his 1980 memoir, and Leaming makes a good case that, in writing this book, his crafting and narrative focus, and his interviews with Jackie, appear to be subconscious stirrings of his own PTSD.
3. Leaming discusses how Jackie also tried to navigate political tugs of war between RFK and LBJ, and how she really kind of liked LBJ, despite some ideas to the contrary.
3A. She really leaned on McNamara a lot during these years.
Anyway, that's enough of a sketch. It's a good book.