Heera Pheri by Surendra Mohan Pathak

Taxi driver Jeet Singh is cruising for fare when a man being tailed by a bunch of goons blocks his way. Entrusting him with a briefcase full of secret, classified government documents to be delivered in lieu of a huge sum to a girl in Jogeshwari, he jumps off the moving taxi. His dead body is found by the railway track in a Mumbai suburb the next morning, while Jeet Singh finds he has nobody to give the briefcase to; the girl died mysteriously the previous night. He opens the briefcase, and a free-for-all for diamonds worth millions is set into motion. From the badshah of crime writing comes another blockbuster of a novel, Heera Pheri.