the serial killer dubbed 'stoneman' by the media has just claimed his fifth victim and the case is still of little interest to the bombay police. but to suspended sub-inspector sanjay shelar (kay kay menon) (for custodial death of a gangster) this killer poses an opportunity for reinstation. with the secret aid of his patronizing superior aig satam (vikram gokhale), sanjay takes up the arduous process of tracking the murderer without any legal assistance. he asks help from an aide constable and friend kamble (virendra saxena) whose wife has apparently run away. the official investigator of the case, inspector kedar phadke (arbaaz khan), clashes incessantly with sanjay. they, separately, dwelve deeper into the case, patrolling the city on their own. sanjay takes the help of his informer ghanshu(ashraful haque) who tells him about mohammed, a cab driver operating only at midnight, whom everyone on the streets is starting to suspect as being the stoneman. ghanshu is eventually also murdered on the footpath by the stoneman. the stoneman is shown to be killing people sleeping on the streets (beggars, workers, sweepers etc.). another night the stoneman tries to kill a beggar sleeping on the roadside but is saved by kedar and some patrolling policemen. kedar sees sanjay and now starts to suspect him as the murderer. sanjay finds that his private investigation room has been visited by the stoneman as he sees vermilion smeared everywhere in the room. he also learns that mohammed has run away from the city.