Miss Marple: 4.50 from Paddington

Elspeth McGillicuddy is taking the 4:50 from Paddington (a train) to visit a friend and falls asleep. She awakens to see another train on a set of tracks parallel to hers. Suddenly, a window shade zips up and Mrs. McGillicuddy sees a woman being strangled by a man whose back is to her. The train moves on and Mrs. McGillicuddy is left is significant distress. The person she was visiting? Miss Marple, of course. And we're off to the races.

Miss Marple's investigations bring her to the doorstep of the eccentric Crackenthorpe family and she hires a formidable assistant in the guise of the lovely and efficient Lucy Eyelesbarrow (Jill Meager) who infiltrates the household in the guise of a housekeeper. She becomes Miss Marple's eyes and ears.

It's arguably one of the best of the Marple mysteries. In part because when I read the book, I was completely surprised by who the murderer was (some excellent literary misdirection here) but also because the story contains a series of characters who are, for the most part, fairly sympathetic (unlike the detestable Fortescues in "Pocketful of Rye"). And the hint of romance between Lucy and one of the suspects is a nice addition.