"The Umbrella Man"
Here's what Errol Morris, the (famous) documentarian says about it:
For years, I’ve wanted to make a movie about the John F. Kennedy assassination. Not because I thought I could prove that it was a conspiracy, or that I could prove it was a lone gunman, but because I believe that by looking at the assassination, we can learn a lot about the nature of investigation and evidence. Why, after 48 years, are people still quarreling and quibbling about this case? What is it about this case that has led not to a solution, but to the endless proliferation of possible solutions? . . .