We, as "normal" people, cannot imagine what really goes on inside the head of those suffering from more advanced dementia. We only know for sure what is reflected by caretakers and psychiatrists. Yet, Florian Zeller has done a tremendous job of immersing us in what may be the experience of one suffering individual. As a caretaker of two parents who both went this way, it is about as accurate an experience as we will ever come to understand. This is a powerful drama, made real by an absolutely amazing acting by Anthony Hopkins.