While he can't declare this without facing libel, he strongly suggests that more than one person in law enforcement are responsible for the murders, after each victim came to know too much and put the men in danger. There definitely is a "power of the pen" at work here, the way the journalist put together the material for his book and ultimately the documentary. Conversely law enforcement think they are doing everything they can to solve the crimes. The gist is the Jennings locals, particularly family and friends of the eight victims, are frustrated by what they judge is lack of interest and lack of effort by law enforcement, including the FBI. So I watched the first and the last episodes completely. While the subject is always interesting 4.5 hours is a long time to spend watching more and more of what is basically the same result. The area seems to have seriously gone downhill over the past 40+ years. So I have a natural curiosity for these yet unsolved murders over a 4-year time period 40 years later in the Jennings area.
Four of us even spent part of a night in the Jennings jail for mischief in 1965. I grew up not far from Jennings, as college students we drove through Jennings on weekends to get to the night spots in Lake Arthur.
This was a Showtime network presentation, I found it available as a 5-part series on a set of DVDs from my public library.