I have prosopagnosia, and movies are often a problem. I recall an Agatha Christie film where the opening was set at a big dinner party. All the men were wearing

I have prosopagnosia, and movies are often a problem. I recall an Agatha Christie film where the opening was set at a big dinner party. All the men were wearing dinner jackets, and we were shown lots of plot-critical conversations about expected legacies and old feuds. I gave up at that point: there was no chance of me having any clue about the plot.