Three amateur thieves plot to kidnap the son of wealthy Mehta from school. They do a trial run. However, on the eve of the kidnap, the guy whose job is to operate a crane in this plan is hospitalized. The services of Avinasi a.
k.a. Mumbai Xpress , a deaf stunt man performing daredevil bike acts is roped in. Twists and turns take place where the other two gang members are hurt and invariably Mumbai Xpress is left to perform all the tasks by himself.
He kidnaps the wrong boy, Daddu , the illegitimate son of Ahalya and police officer Rao , but manages to get a huge ransom from Mehta by default. A brawl takes place between the original kidnap planners - Digambar, Johnson and Avinasi - in handling Ahalya's child but Avinasi delivers the child unhurt to his mother. He secretly listen to Ahalya's tele-con with Rao where Rao wants to settle both the ransom and sever his ties with her. Ahalya pleads and coaxes him to help her get the ransom which Rao is willing to pay.
The child takes a fancy to Avinasi and wants him to be the man in their life, and gets him to agree. Ahalaya wants either Rao's or Mehta's money which Avinasi is holding, whereas Avinasi is in love and wants to be that protective person. Rao appoints Mehta to handle the ransom and what follows is a series of mix-ups..
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