The Serpent. Very good, even though a couple of the middle episodes are a bit tedious. The fact that it is based on a true story is really frightening. I'm sure more of that stuff goes on than we're aware of.
Also, while I'm not sure it is on Netflix, if you're into documentaries, the film Honeyland is REALLY good. My wife and I couldn't decide whether it was a documentary or a foreign film, except that the characters and situations seemed to be too genuine and unscripted. I read later that it is, in fact, a documentary, but it took 3 years to shoot, and had over 400 hours of footage. Not only is the story very interesting when you juxtapose the much simpler, but in many ways harder, lifestyle with that in North America, but the filming is incredible. You can pause the film in many, many places, and the scene looks like some kind of painting from a Renaissance artist. It's a great film.