Stonehearst Asylum (2014)
Hard to say anything about the plot without spoiling, as it relies heavily on twists to stay engaging. Unfortunately it's also pretty predictable. Has a central theme about madness which jives well with me, but other people would probably find its messages muddled.
Best part was set design, which sounds weird, but they do an excellent job setting the period and making the Asylum feel like it's undergoing physical decay over time.
Worst part is at the end. A plot twist is explained and a character playing chess literally says checkmate after. Cringe.
Very heavy British accents and a lot of whispering. Watch with subtitles.