Some interesting insights into the history of the family and the generational disfunction that might have shaped Trumps behaviour and outlook. The salient information already has been published a long form essay. The rest is filled meandering trivialities that are pretty unremarkable. There's nothing massively revelatory, other than further evidence that his father was a total a-hole, which clearly impacted Trump.. Lots of whining by Mary about getting screwed out of inheritance which is sad for her but not particularly uncommon in big rich families, although the fraud involved is pretty astonishing, and the scale of it would not have been known without Mary giving documents to the NYT
Ironically the book seems like a bit of a cash grab... maybe she feels like she deserves it after losing the inheritance, but I can't help but notice the irony of it all.