The film is copy of the Hollywood film of the same name. At the end of the film there are more questions than answers about the plot in the film. Like fundamentally important question as to why on earth does she travel by train everyday when she is basically unemployed? And to go where?
Why does the PI have a dark room when he uses a digital camera? Why does the PI blackmail only Nusrat and not Shekhar? Etc etc etc.