One of the best thrillers of bollywood which keeps you engage right till the end. All the characters are very well etched. The screenplay is very well written by Nasir Hussain which is ably supported by RD Burman's lilting music. Shammi Kapoor fits the role to the T, Asha Parekh is lovable and the remaining supporting cast which includes Helen, Premnath , Prem Chopra and others do a fine job.Overall an entertaing movie which should not be missed.