Sorry about the delay - I didn't have good computer access Friday evening.
The Incredible Theft is a short Poirot novella set on a country estate. Important documents go missing - which of the guests is responsible? I remember reading this one back in the day, but Christie still managed to keep me in suspense throughout the story. Good job, Agatha. Of course there's a glaring logical loophole in the solution....but what the hey. I was fooled.
Suchet does a much better job than Nigel Hawthorne.