Kind of disappointing, because the letters aren’t allowed to stand on their own. Almost every one is introduced with context, often unnecessary; and worse, each one has a cutesy ‘title’ in italics which is a phrase excerpted from the letter. I trained myself quickly to ignore these titles. I’ve always found it annoying to read something in a pull-out, and then read the exact same words again.
The letters span her adult life and are chronological. It is sad to thus ‘watch’ her grow old.
No new revelations here for any serious fan.