The film starts with Mumbai police officials deliberating how to crack a spate of robberies targeting the rich in the city by a masked thief called Bagula Bhagat. Inspector Anand (Sujeet Kumar) is given charge of the case.

Meanwhile, one gets to see musician and singer, Manmohan, alias Moni, working in a hotel owned by Seth Daulatram (Premnath) who is pursued by Sunita aka Soni, a pickpocket, who lives with her foster mother (Sulochana). In fact Sunita’s rich businessman father died when he was duped by his treacherous manager, Daulatram.

Actually, Bagula Bhagat is Moni in disguise, whose informers (including Birbal and Tuntun) garner information about the misdeeds of unscrupulous traders and businessmen. These then become the target of Bagula Bhagat, who robs them of their riches only to distribute among the poor and the needy. Moni’s heart beats for the ill trodden after a childhood incident, in which his grandfather was killed by a ruthless landowner, who not only belittles him for his poverty, and mocks him about Moni’s mother having been duped by a rich man.

After a series of incidents-some interesting, others outright boring and outlandish Moni and Soni agree to teach Seth Daulatram a lesson for his misdeeds. But before that, Moni comes to know that Soni’s foster mother is actually his mother and that inspector Sujeet Kumar is the fiancé of his foster sister. The film ends after a courtroom drama, in which the judge tries Bagula Bhagat for his misdemeanours. Does the judge take a lenient view of Moni’s plea for rights of the poor? Or is he delivered a harsh punishment?

• Dev Anand ... Moni
• Hema Malini... Sunita "Soni"
• Prem Nath ... Daulatram
• Ranjeet...Ranjeet
• Sujit Kumar ... Anand
• Raj Mehra
• Sulochana Latkar...Parvati
• Mehmood Jr.
• Chaman Puri
• Birbal
• Mohan Choti
• Mumtaz Begum
• Ram Mohan
• Krishnakant
• Dulari
• Tun Tun
• Rajan Kapoor
• Moolchand
• Helen
• Uma Dutt
• Master Sailesh
• Master Ravi
• Tanuja Mukherji as Rekha didi