It appears that the reviews here come from two ends of the spectrum. This isn't a documentary but was based on a Dateline story about a psycho/sociopath. Great cast. Unfortunately, episodes are only dropping once a week so for the curious who haven't seen the original Datelines it may get aggravating waiting for the weekly episodes. I had to look up the crazy story while awaiting the final episodes. I should have waited to watch all at once.