BBC adaptation of the Agatha Christie story: should still be on iplayer.   Great cast, beautfully costumed and filmed.  I read the book many years ago and I'm sure I saw a film too, but I couldn't for the life of me remember whodunnit!   Which was great, as I had all the fun of working it out again.   This was gripping viewing, and one of the TV programmes I've actually watched while it's being broadcast rather than later, because I couldn't wait to see what happened!   It wasn't the usual TV Poirot or Miss Marple fare, but was much darker, and the atmosphere felt to me more like a horror/psychological thriller than a crime/detective show.  I hope the BBC makes more like this.

Also lots of eye candy, especially in episode 2.