This movie is 2.5 hours long, but it easily managed to keep me engaged. I found this to be brilliantly told. You're constantly wondering what might have happened. And whether you can trust the suspect and her view of the story. The dialogues felt very authentic and all was brilliantly played by everyone involved, but I found especially Sandra Hüller's and Milo Machado-Graner's (who plays her son) performances remarkable. Extra points for authentic piano playing.