Bollywood mystery thriller, Humshakal, directed by Jambu was released in the year 1974. The movie starred Rajesh Khanna and Moushami Chatterjee in lead roles while Tanuja, Jagdeep, Asit Sen, Asrani, Aruna Irani, Meena T. and David Abraham also played significant characters in the file. The music of the movie was composed by the legendary music director Rahul Dev Burman while the songs were sung Mohammed Rafi, Kishore Kumar, Asha Bhonsle and Lata Mangeshkar.

The movie starts with a poor guy named Ram ( Rajesh Khanna ), who works as a labourer. One day he witnesses an old women, who is just about die. The women ask him to promise her that after her death he will take care of her young daughter, Radha ( Moushami Chatterjee ). Ram promise her that he will take care of her daughter and the women dies. Ram enquires Radha about her mother’s death and also about her last wish. Soon Ram and Radha get married to each other.

Ram and Radha are living a happy life. Soon Radha gets pregnant and delivers a baby boy. Ram generally lives away from home for his work. One day, the child becomes seriously ill and Radha decides to enquire Ram about it. She immediately goes to Ram’s employment place and get shcoked to learn that Ram is actually living a parallel life as Laxman. He is also married to another women named Lalita ( Tanuja ). What circumstances forced Ram for living a parallel life?

The hit songs of the movie are:

1. Dekho dekho main kitni sayaani hoon
2. Aao bachchon main tumhein ek kahanai
3. Fans gayi udati chidiya
4. Hum tum gum sum raat milan
5. Dekho mujhe dekho
6. Rasta dekhe tera
7. Main tumko doongi saiyyaan