"Cat among the Pigeons" was written about a decade after the end of WWII, so it made some kind of sense that Mrs Upjohn had been an Intelligence Officer during the conflict. The TV production seemed to be placed pre-War, which made the revelation that Mrs Upjohn had been a Secret Service agent less plausible.
The book, of course, doesn't introduce Poirot into the action until near the end - by which time murders had been committed and the police had asked all the questions. Shoe-horning Poirot in at the start of the TV show made him look somewhat unnecessary - with violence happening around him while he wandered around corridors, peeking in at the schoolgirls.
And how utterly laughable that the headmistress of a top boarding school would ask a visitor to help her choose her successor. Even more laughable that Poirot would agree!
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