Secret agent 116 named Gopal has been assigned the case of homicide of a fellow secret agent 303 by the head of CID, who found evidence that can help identify the perpetrators. During this investigation, Gopal meets with lovely the Sunita, and both end up falling in love with each other. The traitor responsible for killing of agent 303 goes to meet 303's sister Kamla, and tells her that he is a CID inspector and investigating his brother's case, warning that her brother's killer may attempt to pretend as his colleague and friend to meet her. Gopal goes to meet Kamla and sees 303's portrait and notes down the studio photographer's name, but Kamla is convinced that Gopal is the killer of her brother. Kamla is approached by another mafia don, Damodar, for her help in eliminating 116, which she agrees to. Rest of the movie follows the his efforts to thwart a foreign conspiracy against India.
