I enjoyed this one too very much. Especially when Anne, having found damning evidence, makes her escape hurrying through the streets, only to be followed by the villain. Simon's rescue was great.
Jean Marsh was interviewed on tv recently, and she has aged very well, doesn't look all that different.
She became a very rich lady not so long afterwards. She and an actress friend were discussing how both their mothers used to be domestic servants in large houses, and the fact that in tv shows and movies, servants lives were never highlighted. So Jean and her friend Eileen Atkins devised a tv show called "Upstairs and Downstairs" set in Victorian times,which was to air all over the world, and win lots of awards, and ran for many episodes. It is still being repeated riight now, and Jean played a housemaid called Rose, right from beginning to end.