Shot Caller is an indictment of the American prison system. It tells the story of a guy with no criminal past, sent to jail for a traffic accident with consequences, who has to get deeper and deeper into crime in order to survive that hostile environment.
Shot Caller makes a very valid point on how the American prison system serves no measurable social good. However, at the same time it seems a bit too in love with the violence it depicts. Overall: Drifting between 3 and 3.5 out of 5 crabs.