And Then There Were 34: The Moving Finger by Agatha Christie

It may surprise some listeners to learn how mixed we were on our
third Miss Marple novel, given what fans we are (yes, even
Catherine) of our dear spinster sleuth. But that just means we had
lots and lots to discuss, so get out your gluestick and sharpen a
skewer because we've got more than a few moving fingers to account
for in the seemingly sweet (read: not at all sweet) village of
Lymstock.