A murder mystery and a musical love story that with highly lovable star pair of the hit 'Dil Deke Dekho' (1959). Sunita (Asha Parekh) who goes to Mussoorie with her college hockey team, is also determined to avenge the death of her sister Rupa. Rupa had apparently committed suicide when she was rejected by her lover Rocky (Shammi 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 takes a twist when the police realize that Rupa was actually murdered. And when Sunita discovers who Rocky really is, she is furious... But who is the killer... Rocky? The dancer Ruby (Helen), who is in love with Rocky? Or Rupa's jealous fiancee? Watch 'Teesri Manzil', the mystery flick you will fall in love with!