Devil's Knot is indeed based on a true story. It delves into actual incidents and the people involved, presenting a fictionalized account of those events.
Well, the 'devil's knot true story' mainly focuses on a legal case. There were some people who were wrongly accused of a very serious crime. The story delves into the investigation process that was full of flaws, and how the media also played a part in fueling the public's perception which was far from the truth. It's a story that makes you think about the importance of a fair and thorough investigation in the justice system.
It's about a real - life case. It likely involves some sort of mystery, crime or complex situation that was based on actual events. But without more specific knowledge, it's hard to say exactly.