It's a good thing this film is well acted and, for the most part, well photographed. The plot almost ruins the story, since it's ridden with "deus ex machina" devices that Christie must have dreamed up in a desperate attempt to finish the novel for her publishers (unless the fault lies with the screenwriter, of course). I recommend watching strictly for the atmosphere and most of the acting, although the actress in the key role of the spoiled daughter might have benefited from more experience. All in all, watch this one only if you need a break from the estimable Midsomer Murders.
Review of Miss Marple: At Bertram's Hotel
