Another THS castoff: Oh, Bury Me Not by M.K. Wren.
1970s! In actuality, I don't think you'd really know that it was old. The lack of technology is the only real difference - and it's not overt. People are pretty much the same :)
This one is about a feud between two neighboring cattle ranches in Oregon. Then there's a death - and everyone is blaming everyone. It was a good mystery!