Remake of The Citadel.
This film was a major break for Mumtaz as heroine and she was paired with Dev Anand for the first time. This film was Vijay Anand's first film as producer.
Hema Malini was a newcomer when she did this film. Her special appearance became as successful as Rajesh Khanna's in Andaz the same year, eclipsing the heroine Mumtaz. Vijay Anand had wanted to work with both Hema malini and Raakhee, who had arrived on the film scene around the same time. He signed Hema Malini to play the glam film star here and signed Raakhee for the more sober role in Blackmail.
Dev Anand signed Mumtaz for 2 films in 1971, Tere Mere Sapne & Hare Rama Hare Krishna. Ironically Mumtaz was eclipsed in both - by Hema playing a glam film star in a special appearance in Tere Mere Sapne and Zeenat playing the iconic drug addict sister in Hare Rama.
Mumtaz and Hema Malini, this is their first Navketan movie and they first time worked with Dev Anand and Vijay Anand.