This is the second and last of the new Christie mysteries that will be shown on PBS, at least for now. (The final three stories in the series will be available starting next week on Acorn TV, and won’t appear on public television until later.) Tonight’s story, starring David Suchet as Hercule Poirot, is Dead Man’s Folly – and one of the interesting things about is that much of it was filmed at the late Christie’s actual estate, which she used as inspiration for her story’s setting in the original 1950s version. Speaking of which: the plot has to do with a “murder mystery party” gone awry, presenting a social role-playing phenomenon that really didn’t catch on for another few decades. Check local listings.