Well, this is a strange one and no mistake. The basic plot is well-known: a nurse is sent to observe a young girl who appears to be perfectly happy not eating. What is perhaps not s well known is the hard, fact-based viewpoint that the nurse (played brilliantly by Florence Pugh) brings to the situation. I'm not going to say here if she solved the mystery, if indeed there was a mystery to be solved. But you should watch it to find out for yourself.
   The whole thing is very well done, and well worth a couple of hours viewing time.