We quite enjoyed this film. We don't mind 'slow'. I thought it was cleverly done and had quite a surprising twist at the end. The dementia was believable and very well acted.
Yes, it's about old people. Yes, it's slow. And yes, it deals with dementia. BUT the story is terrific, Plummer is at the top of his game, and the movie hardly puts a foot wrong. As long as you go into it not expecting action or pyrotechnics, you may well like it.
This film just never got going for me. Christopher Plummer's 90 year old character with dementia was annoying from the very start, the plot was merely the same ten minute sequence repeated over and over to the point of making me scream, and the twist at the end was so contrived and obvious as to be embarrassing.
I think we have had enough "thrillers" about WWII, the Holocaust, et al, and this was merely the same old tired story playing out its final throes way beyond its sell by date. It is by no means a bad film, just one that lacks any originality, spark or point in my opinion.