Saw this on Talking Pictures channel (UK - old films and TV) who are running all 4 of the original Maigret series (BBC, early 60s). This story was about the murder of a fortune-teller, and needed some nifty unravelling by Maigret and his team.
I hadn't read this book, and the story gave the impression that a few short-cuts had been needed, to squeeze everything in the runtime of an hour? But the plot moved at a good pace, and by this 3rd series, the budget must have gone up, as there were several bits of outside filming, and a good bunch of extras in several scenes!
Yet again poor Madame Maigret (the excellent Helen Shingler) got taken away for a break, but then lost her hubby for a while as he gradually explored the truth and lies that the protagonists were offering. Maigret's fishing knowledge came in handy, and there was a great twist in the ending as one of the criminals got tricked.