And Then There Were 57: The Murder at the Vicarage (I.e. Our First Miss Marple!) by Agatha Christie

Introducing… Miss Jane Marple! We could not be more thrilled to
have reached, at long last, Dame Agatha’s most celebrated amateur
detective. Join us as we endeavor to untangle not just the rather
traditional puzzle mystery we find in this novel, but the character
of Miss Marple herself. Is she a cynical yet well-meaning old lady
with a knack for problem solving, or is there something more
devious, even sinister about her powers of observation and
inference? Come take a listen before you too fall victim to “sleepy
sickness” and turn into a completely different person. (No,
seriously: that is a thing in this book. It’s very weird. And not
at all a spoiler because it has nothing to do with... anything.)