The psychological horror film Unsane follows Sawyer Valentini, a young woman portrayed by Claire Foy, who enters a mental institution for anxiety treatment and is committed involuntarily.

Between them, Raúl Castillo and Melonie Diaz have racked up some brilliant credits. From Diaz’s appearances in The Belko Experiment, Lords of Dogtown, and The First Purge, and Castillo’s work in ...