Yakeen (Hindi: य़कीन, Urdu: یکین) is a 1969 Indian film directed by Brij. The movie included stars like Dharmendra in a double role and Sharmila Tagore. They were ably supported by David, Shetty, and others in the movie.
According to one source, the movie was a semi-hit at the box-office reinforcing Dharmendra's star status in 1969. Sharmila Tagore appeared in a very glamorous role in the movie though her role in Aradhana was a stark contrast the same year.
A police officer, Rajesh is an expert in explosives and chemicals. Rajesh lives with his dog and his cook, and has a love interest in Rita. The department in which Rajesh works discovers that there are people interested in stealing information about explosives from them, and start to guard against such an attack, but Rajesh is kidnapped and taken abroad. The kidnappers keep Rajesh imprisoned and send a look-alike, Jackoss, back to India to deceive the department. Jackoss is a non-Indian, with blue eyes and a voice different from Rajesh's. To deceive Rajesh's department, he uses contact lenses and tells them that he lost his voice in the kidnapping. Rita believes him and accepts him as Rajesh, although she has some misgivings.