Calcutta-based Naval Officer Shankar Choudhry lives a rich way of life along with his physician dad, and mother. In the future whereas returning dwelling in a cab dwelling from a Membership, he comes an injured man, Shekhar, takes him dwelling, has his dad nurse take care of him, in addition to goes to his dwelling to inform his sister, Neela. Each Neela and he fall in love with one another. When Shekhar recovers, he returns dwelling, and it's then that Shankar notices a change in Neela. When he questions her, she refuses to reply. Then Shekhar is shot and killed in his house. A Police Dectective Officer assigned to this murder - has a lighter with the phrase 'S' engraved on it. This leads him to suspect three individuals: One is a gangster named Shyam Sunder, second a delinquent runaway little one, Sushil Kumar alias Daaku, who lives along with his maternal uncle and aunt; and the third is none aside from Shankar Choudhry himself.
