Sharmeelee (1971)

While returning from his Army Base, Captain Ajit Kapoor stops over at a rest-house, where there is a party on, and he meets a charming, vivacious young lady. When he reaches home, his guardian, Father Joseph, wants him to get married. Joseph accompanies Ajit to see the girl, whose name is Kanchan, and Ajit is thrilled to see that it is the same girl he met at the rest-house. Ajit indicates his approval, and the stage is set for them to get married. Only later does Ajit find out that Kanchan is the shy twin-sister of the girl he originally met. Kanchan is heart-broken at his rejection. Ajit finally meets Kamini, but then Ajit's Army Colonel summons him for assistance in locating a female spy, who closely resembles the twin sisters.