An unpleasant man does unpleasant things to his unpleasant friends and unpleasant acquaintances, who do unpleasant things back to him, possibly for all eternity.
There is no doubt an audience for this very classy, well-made and well-acted soap opera, consisting of people who think the world unpleasant and like to have their noses rubbed in it. There are such people, and they deserve to be entertained as much as the rest of us do.
However, viewers should be aware that, though it borrows Agatha Christie's title, her characters, and several plot elements, this bears no more than a superficial resemblance to Christie's novel, but free-rides on Christie's reputation, presumably in order to boost its viewing figures. I can think of no other reason for it to pose as a Christie adaptation.
