I've been an Anglophile since I was a kid, but only recently had the patience to read Agatha Christie's books (so much detail!!). Bertram's Hotel became one of my favorite because Miss Marple goes to the big city and visits places she knew as a child. We get a bit of Little Jane and what she enjoyed.
The British have always been great at adapting books to film. This Bertram's is an excellent example. It maintains the integrity of a book while condensing it into a short span.
Bertram's Hotel is all that and more. The plot, characters and environment are beautifully done and wonderful to watch. An aging Joan Hickson (one of her later Marples) appropriately plays the aging Miss Marple. A friend replies "She must be 100 years old," or something to that effect.
The mystery is intriguing and I love seeing one of my favorite sleuths still able to see everything for what it really is, while fooling everyone with her elderly appearance. I love the actress who plays Bess Sedgwick. She hits the mark as Christie wrote her and she's fun to watch. I actually cared a great deal about her although some things about her character are not so hot. That pretty much goes for all the characters with one exception. Vadislaus Marinovsky is appropriately arrogant, still in keeping with the book.
This episode of the Miss Marple series with Joan Hickson is absolutely wonderful. I bought the DVD set and watch it often.
ONE WORD OF WARNING: If you're a newbie, do NOT mistake the two series. The new Marple series with Geraldine McEwan is terrible!!