Just listened to this one while driving back from Wichita Falls. Great buildup, good tension throughout, beautifully simple structure. I figured the first visitor was a Red Herring as soon as he showed up
, but it was still a satisfying turn and reversal anyhow.
I disagree with the endnote re: the main character doing "Everything right." She clearly makes a massive mistake of judgment, and then makes a few smaller mistakes that ultimately undo her, and throughout her selfishness undermines her judgment.