It is a thriller movie. A little bit of romance to give a background to the protagonist. He has his personal life and he has his needs that any human has. (He being a hero, some sacrifices of personal needs are expected from him). The protagonist is an honest young man who works in an important government-laboratory that involves some government secrets.
The thrill begins when a high level officer of the lab is murdered. Investigations inevitably follow. Even the investigations hold the element of surprise for the audience. The protagonist is clean.
Then follows the thrill of the planning. How the villeins undertake to execute their high profile villainous deed. They are sophisticated. Well organized. A huge organization. Their plan is also thrilling. That is, to fool the organization of the Indian government in a really surprising way. (Not a spoiler). It is to send a look-alike of the protagonist in his place and do the harmful activities. So they first kidnap the protagonist. The doppelganger is given a lot of information about the protagonist so that no one would identify him. But, no amount of information can be complete. So, inevitably he runs into trouble. But somehow he manages to save the situation for himself. But some government officers have some doubts regarding his identity. So some investigation follow. But surprisingly even the investigations are managed by the villainous organization! The look-alike is not the only implant in the lab! In a thrilling sequence, the protagonist uses his ingenuity to escape and reach the lab. The villains are about to execute their plan when, at the last thrilling moment, he foils their plan.
Their are some good songs in the movie.
The acting of all actors is good and dialogues are simple, not over-dramatic.
The locations are serene and peaceful.
In many movies such themes are used, so even if it might have been interesting in the 1970s, today it seems dull. Only the good acting saves the film.