I thought that M was a great movie. The murderer was absolutely creepy, especially in the scene where he sees a little girl in a reflection and watches her with huge wide eyes. The actor did a good job portraying that character. I loved the idea of the homeless people acting as informants and holding a trial for the murderer at the end. I was shocked to see how many people were in that room. Overall, great suspense, great characters and very well made.