I got some great news via text today:
here it is. Otherwise, I will paraphrase for you. The writer of one of the great classic American books, Harper Lee, wrote another book prior to To Kill a Mockingbird. Sixty years later, it is being published! She actually wrote this one prior to To Kill a Mockingbird and the publisher urged her to instead focus on the flashbacks to Scout's childhood which is how we got To Kill a Mockingbird.
P.S. I love that I have a friend who loves books and the English language as much as I do and uses "posthumously" in a text.