One of the most powerful set of documentaries I've ever watched are Paradise Lost: The Child Murders at Robin Hills and Paradise Lost 2: Revelations, about the unfair murder convictions of three teenagers, which the media dubbed the "West Memphis 3."
Earlier this year, the convictions were overturned and the three boys (now men in their 30s) walked free. The filmmakers who told the first two parts of the story continued filming and have completed the conclusion to this real-life trilogy, Paradise Lost 3: Purgatory.
It debuts on HBO January 12 at 9:00 p.m.
Here's a sneak peek: