Kill List (2011)
I'm always game to recommend this great British import, but once you see it you'll know why. Like Get Out, Kill List deals with secret societies that are up to horrific, clandestine behavior. Their end game is one of the most shocking reveals in modern movie history. After sucking you up with a straightforward crime movie premise, Kill List descends into darkness, unleashes violence, slams your brain on the floor, and leaves you just a bit shaken when it's all over.
Where to watch it: Stream on Shudder and Hulu; rent on iTunes, Amazon, and YouTube