The Ballad of Frankie Silver by Sharon McCrumb.
The sheriff of a fictional rural county in East Tennessee is invited to witness the execution of a local man he arrested 20 years ago for a double murder on the Appalachian Trail. He remembers what the then sheriff told him at the trial:
There's only two murder cases in these mountains I'm not happy with. One is the fellow you're about to put on death row, and the other is Frankie Silver.
So he ruminates over both of these cases, wondering if justice was served, or if something was missed. The Frankie Silver case is told through Burgess Gaither, clerk of the court that tried and executed her.
I think I'll count this for folklore (3A) bingo square. The author did significant historical research into Frankie's case which after 200 years is probably more legend than fact. Other of McCrumb's novels might also be good recommendations for this category, or just in general.
Recently finished The Housemaid. It felt more like chick-lit than what I'd normally go for, but someone said I should read it and lent me a copy. The main plot premise was solid. The reveals were less surprising than perhaps the author intended, but well written regardless. I've scored it under film adaptation which is cheating, but I'm told Sydney Sweeny will make it valid before the bingo closes.
Up next I think is going to be Saving Fish from Drowning by Amy Tan. Not far enough into it to recommend yet, but looks as if it could be interesting, and set in a part of the world I'm underinformed about.