This noirish melodrama is also an interesting meditation about theatre, seen as a distorting mirror of a highly stylized reality. Not surprisingly, Mann fills up the screen with mirrors and curtains, suggesting his charaters are always acting, both on and off the stage. Here you can find a nice selection of his mirror/curtain shots: http://simonestarace.blogspot.it/2012/02/la-fine-della-signora-wallace-great.html
Stilted acting and an implausible basis to the story made this diffucult to enjoy. He doesn't want the cops called because he'll be dead by the time they arrive? It took him an hour to die! But then again, it also took an hour for the cops to get there. Don't die in Mexico City in the 1930s!