Here's an example of Christie reusing old material. One the characters is named Bella like the one in her Dumb Witness story, and also we have an instance here of Poirot being summoned to help out someone whose life is on the line and he arrives too late - again, like in the Dumb Witness story. It's also in some ways a case of mistaken identity as in Dumb Witness. The story takes place in Merlinville-sur-Mer in France where Poirot arrives with all Hastings at the Villa Genevieve to discover that mister Renauld was stabbed in the back with a letter opener the previous night, and left in a newly-dug grave by the local golf course.
The worst part of this story for me was the appalling reading by Charles Armstrong, who has no idea how to pronounce French words and repeatedly mangles ones such as Sûreté and Genevieve. When he tries to imitate a female voice his own voice sounds like he's being strangled. It was horrible to listen to and I couldn't stand to hear any more after the first 15 percent or so. I DNF'd this and consider it a warty "read".
I got hold of the DVD for Murder on the Links as well as Dumb Witness. Of the two, the latter departed from the book the most - and by quite a considerable margin, but I enjoyed that filmed story. It was cute and amusing, but Miss Peabody was totally absent, which annoyed me to no end. Murder on the Links, by contrast, was a lousy story which made no sense and in which Hastings was a complete dumb-ass (even more than he usually is) who got rewarded rather than getting his just deserts for actively perverting with the course of justice.
Having DNF's this, I can't comment on whether the book was as bad, but the TV show in regard to this particular episode simply isn't worth watching. Worse than this though was that despite the story taking place almost entirely in France, every single person spoke with a perfect English accent with no trace of actual French marring it whatsoever! Even French words like Genevieve and Sûreté were mangled. It was almost as though it was filmed entirely in England with a complete English cast! Whoah! Trust me, it sucked. I think it's by far the worst Poirot episode I ever saw and I've seen most of them so this one is double-warty!