Musical love story and murder mystery repeating the star pairing of the hit Dil Deke Dekho (1959) as well as its locales, the hill- station and the hotel dance-floor. Sunita (Parekh) goes to Mussoorie with her college hockey team. She is also determined to avenge the death of her sister Rupa, who had apparently committed suicide when she was rejected by her lover Rocky (Kapoor), a drummer in the hotel’s jazz band. Rocky meets her and, wise to her intentions, disguises his identity. The two fall in love. The story picks up again when a policeman (Iftekhar) reveals that Rupa was murdered. The dancer Ruby (Helen), who is in love with Rocky, and Rupa’s jealous fiance (Chopra) are prime suspects. In the end, a subplot is quickly developed and the murderer caught. The film included classic Mohammed Rafi and Asha Bhosle duets such as O hasina zulfonwali, Aaja aaja, O mere sona re sona re and the quixotic Rafi solo, Diwana mujhsa nahin, energetically picturised on the ageing but lively lead duo.
"O Haseena" and Saleem Khan, Salmanother songs feature a drummer in black who is in fact Salim Khan, Salman Khan's father.
Dev Anand was originally cast in the leading role, but dropped the film after having a falling out with producer Nasir Hussain. When Shammi Kapoor was approached for the role, he told Nasir Hussain he would work in the film only if Dev Anand tells him personally he is not working in the film out of his own will, and that he is fine with him doing the film, which is what happened.
Shammi Kapoor's wife Geeta Bali died during filming. The shoot was cancelled by a grief-stricken Kapoor and filming was put on hold for 3 months.
Producer-Writer Nasir Hussain was romantically involved with heroine Asha Parekh despite being married to assistant choreographer Ayesha Khan.
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