Jambulingam

When it's discovered that four prominent members of the community are crooks and black marketeers, young Akash (Rajesh Khanna) -- posing as an expatriate smuggler -- teams with his girlfriend, Chanda (Mumtaz), to expose them. But to nail the quartet -- a tradesman, a doctor and a builder, all led by a wealthy industrialist (Madan Puri) -- Akash must get them to confess their misdeeds while Chanda surreptitiously captures everything on film.

After assisting an old, dying lady Ram promises to take care of her daughter, Radha.

The philanthropists and pillars of society, a doctor, a builder, and a merchant, led by the rich Dharmalingam, are in fact villains dealing in crime and black market. The protagonist 'Durai' is set out on a quest to vanquish these enemies of the nation

In order to arrange for funds to save his dying mother, Mohan commits a petty theft. Soon, Mohan transforms into the criminal mastermind Mounto and is later hired by the CBI to work for the country.