Actually anurag kashyap is directing the movie which is based on real stories somewhat.
So this raman raghav was a man who is totally a mental case killing the people without any reasons and surrounding himself as if telling that I have done a crime in front of police.
So instantly this movie based on a crime and investigation.One time watch people will only understand the story og raman raghav. The actors have a superb job nawazuudin siddhiq hats off to him fully entertaing act.The director is only using murderer in this film.