 Bhola, a young musician, leaves his small village to go to the big city, with dreams of making a dowry for his crippled sister, Belu. He leaves her behind with their abusive stepmother and loyal doberman, Moti. When Bhola arrives in the big city he is almost immediately believed to be diamond thief and smuggler, Ramjit Kumar, who is currently under investigation by the local police department. Bhola is rushed into a party where everyone mistakes him for Ramjit, while the real Ramjit sits back and observes. Ramjit Kumar decides to train the naive Bhola, to take his place during the investigation - so that the police cannot link Ramjit to the elaborate heist he is about to commit. The police assign the beautiful young detective Meena to go undercover as Rita, a wealthy heiress and diamond connoisseur, with the intent of capturing Ramjit in the act! But instead, she finds herself getting to know the charms of Bhola (masquerading as Ramjit! The remainder of the film is an exciting tale of mistaken identity, and close calls, interspersed with catchy musical numbers, and a suprise ending and thrilling rescue involving Moti the doberman who has unusual canine instincts.