Kab? Kyoon? Aur Kahan?

Asha Prasad, the only daughter of Rai Bahadur Jagdish Prasad, is on a luxury liner, touring the world. She meets Anand, a CID officer, and after a few misunderstandings they fall in love. When Asha returns home, she is shocked to find out that her father has been killed in an automobile accident. Then the police notify her that her father's death was not an accident but appears to have been murder. Stunned at this knowledge, Asha is unable to think of anyone who would even think of killing her dad. One day, her uncle Daljit tries to molest her friends Lata. She intervenes, an argument ensues, Daljit pulls out a loaded gun and in the ensuing struggle he is killed. Lata and Asha put Daljit's body in a large box and dump it in an isolated lake. Then Asha finds out that the Police Inspector assigned to investigate her father's death is none other than Anand, who would like to question Daljit as he suspects him of killing Jagdish. An overwrought Asha must now maintain her equilibrium at all costs so as not to look guilty in the eyes of the law and Anand.