I'd love to help, but I don’t have real-time access to current Amazon Prime Video catalogs (since titles rotate monthly based on your region). However, I can give you a helpful review of one of the most consistently praised movies available on Prime across many regions: The Shawshank Redemption (1994) Where to find it (typically): Included with Prime in the US, UK, Canada, Australia, and India (always double-check your local library).
