The first Miss Marple mystery. I was given a pile of these by my mother because she couldn't stand Christie's writing style, and I can sort of see what she means; it's written from the perspective of the village parson, and the prose is rather flat and lifeless. It's a reasonably clever mystery, but didn't particularly grab me. I'm neutral on this one.
(My copy is a book club edition; the ISBN below is for a cheaper mass-market paperback.)