A Miss Marple Nightcap: Death by Drowning by Agatha Christie

At long last we complete our baker's dozen of stories within the
Thirteen Problems, Christie's first collection of Miss Marple short
stories. Get ready to go DEEP on issues of class--not quite as deep
as our poor, pregnant (!) victim does in a river snaking through
the woods of St. Mary Mead, but deep nonetheless. As we've come to
learn by now, nothing is off-limits where Miss Marple is concerned.