Yakeen is the story of Rajesh Sharma (Dharmendra) who works for the Government of India on a top-secret research project. The films exciting plot revolves around Rajesh's attempts to foil the evil plans of the enemy country that sends its agents to try and sabotage this research project. Dynamites, strategic plans, a dangerous look-alike, unexplained murders together make the plot of this action packed flick. Yakeen is one of the early suspense thrillers based on espionage, produced and written by well-known actor Deven Varma, starring Dharmendra and Sharmila Tagore, ably supported by Helen, David and Kamini Kaushal. Yakeen was Navratna Film's maiden production with music composed by Shankar… more. Jaikishen that included the popular songs 'Gar Tum Bhula Na Doge' and 'Yakeen Kar Lo'sung by Mohd. Rafi.