I've been an Agatha Christie fanatic ever since I was a teenager; I've watched all the adaptations I've ever come across, most are great, both movies and TV series. But, in contrast to recent very impressive movie adaptations, the quality of the TV dramas the BBC makes out of Agatha's classic seems to be in a steady decline. It's understandable that scriptwriters are desperately looking for some way to make the stories who are well-known to millions of fans look different, 'new' in some way - but this is in NO way an excuse for literally RAPING a classic murder mystery, as has been done in this case.
Let alone the fact that a crisp and clever whodunit has been turned into a 'modern' TV drama, gloomy and bleak, with absolutely no character in it that you could describe as halfway sympathetic, the people who are responsible for this script actually went so far as to CHANGE the identity of the murderer! Which, of course, leads to the fact that nothing really goes together anymore, because Agatha didn't just write her stories like that - every little detail fits in. So, absolutely nothing fits in here at the end, because a different ending is superimposed on a story that had been very carefully worked out - not even the title works anymore, because the word 'innocence' isn't supposed to refer to whom we think throughout most of the book.
It's high time the BBC stopped treating the work of the Queen of Crime in this way; millions of fans will be put off, and it's highly unfair to young viewers who aren't very familiar with Agatha's oeuvre - they might think that she actually WROTE trash like this.