The story revolves around a group of incompetent slum-dwellers, lead by Digamber (Vijay Raaz), who take to kidnapping to raise some quick money. The idea is to kidnap a rich merchant's son and demand ransom. But their plan is ill-fated as one of them is hospitalized for an appendicitis operation. The ill man's brother-in-law Avinash (Kamal Hasan) is taken in as a quick replacement.
Avinash is an ace motorist who rides his bike in the Maut Ka Kuan and has the earned the epithet of Mumbai Express. However, Avinash suffers is hard of hearing and is generally clumsy. He also happens to be an innocent youth who has his morals intact. Digamber, desperate to see his plan in action, convinces Avinash to join the team with his half-lies.