A very good documentary about an opposition movement politician who survived an assassination attempt by Putin and the Russian intelligence service. This would be Navalny and he is in prison now. The story of the investigation that Navalny, his crew and the film makers conducted, how they identified and contacted the actual guys who tried to murder him is fascinating. A documentary can succeed on many levels, letting us in on a story that we knew very little about is a big one. This works especially well on that front.