Kamala elopes on her marriage ceremony day along with her childhood pal Ratanlal. Her father Manganlal chases the couple and catches them on a prepare. His livid exchanges with Ratanlal are interrupted by gunfire and within the mysterious gloom of the night a physique is thrown off the prepare. The suspects are Ratanlal, who can't furnish an alibi, Kamala, who insists on being the murderess, ex-convict Sukhdev, who confesses to the homicide claiming theft to be the motive, and the lunatic Tarachand, who additionally admits his guilt.
