Trying to Find a Movie Title [View all]

I think I saw it on Amazon Prime, but you know how you see a movie and think you'll be able to find it again in the same category, but it has disappeared, even when you look for it again that same evening? It's so aggravating. Anyway, it was listed as suspense horror. It was about two couples, I think one was American and they met a British couple in Italy or elsewhere in Europe and the British couple invited them to their country place in Britain I think.