This is why Amitabh Baccan and Farhan Akhtar is called the best actor in bollywood in this type of Movies where a fight against a polluted system where both of them loss their daughter and going to solve the mystery behind their daughters death.
Amitabh is seen more depressed man who have no one to care and one day he met Farhan and their friendship began where they spend their time in drinking and playing chess.
Casting is perfect but story would have been more strong but it is good enough. Its background music is perfect which is relevant to the plot and A R Rahaman bring some spice to the film by his natural way