 Mahender (Nasir Hussain) has been responsible for the upbringing of Tomato (Daisy Irani), a young child at a very early age. Now Mahender s health is getting worse, and he is afraid his ill-health may be contagious and may endanger Tomato. So Mahender decides to leave Tomato in the park near Kamal Roy (Ashok Kumar), and instructs Tomato to call Kamal his dad. Tomato does so, and this results in utter chaos in the life of Kamal. He is unable to convince his lady love Usha Sen (Meena Kumari) that the child is not his; and additionally Kamal is under pressure from his dad and mom (Pratima Devi) to get married. Kamal begs Tomato to leave him, but Tomato refuses to do so. How will this impact on Kamal s life and relationships?