Dev Anand and Zeenat Aman are siblings who are parted when their parents divorce. The two grow up apart from each other and Zeenat Aman believes her brother to be dead. Dev Anand a pilot comes to know that Zeenat has run away from home and joined up with drug addict hippies. In search of her hereaches Nepal where he finds her. She however refuses to recognise him. Dev Anand meets and falls in love with Mumtaz a local belle. Mumtaz however is kept in the dark about the fact that Zeenat is Dev Anand's sister so she cannot understand Dev's obsession with Zeenat. Dev Anand and Mumtaz getmarried. Dev Anand tries hard to get his sister out of the cult. When she realises that he is her long lost brother she can't face up to her past and commits suicide.