After spending the time to finally read the book "The Heart Is A Lonely Hunter", which, by the way, is an excellent work depicting such sadness and angst, I purchased the movie that had been made some years ago. I found this to be an excellent movie. It encapsulates, as best as is possible for a 2 hour movie to do with a novel, the basics of the story. Of course, the book is much better, but that is because books have the opportunity to supply more depth and detail. That being said, I believe Alan Arkin does a fantastic portrayal of Mr.Singer and Sandra Locke's interpretation of Mick Kelly is 'bang-on'.
Well worth the purchase.