The original Agatha Christie short story, which this follows, is far superior in terms of internal logic to its moralistic and illogical-extra-twist later version of forced serving of the justice which does not ring true. This is much more realistic. Done during the WWI 100 year obsession hysteria of the 2010s, it forces some subplot with questionable narrative about survivor's guilt and youth dying and ageism to the point of euthanasia, as well as some off-putting elderly lovemaking scenes. The acting is mixed, can't compare to ms Dietrich but the Romaine role is well done here too, with its own nuances. Vole character is much better played here than in the overrated 1957 film, whose main advantage is the incomparable, brilliant Charles Laughton, in role played here in completely different tone quite depressingly by fittingly off-putting, both inside and out, actor. This mini-series has however a very convincing lesbomaid cat-killer played by Monica Dolan, cat killers do indeed deserve a noose even if they did not kill a rich lady, as cats are infinitely more worthy than rich English gigolo-users. Overall, a gloomy but different take on the piece, whose weakest link is inferior Toby Jones (as ugly as old Laughton, if not much, much worse, but with zero redeeming charm and sickeningly boring gloominess), and the strongest point is getting rid of an extra contrived twist that Agatha put into her story so for "justice" to prevail. As for the WWI subplot, it is not bad, some say it adds to the story, other notice that it in fact takes a bit from it. The letter-twist part was also a bit weaker here but otherwise plot and acting wrt twist and repeated viewings are much better than in the 1957 movie, that is otherwise more entertaining, if a bit overrated - here we have gloomy nauseating realism vs flashy twisty captivating but illogical movie-making of 60 years before.