Kamala elopes on her wedding day with her childhood friend Ratanlal. Her father Manganlal chases the couple and catches them on a train. His furious exchanges with Ratanlal are interrupted by gunfire and in the mysterious gloom of the evening a body is thrown off the train. The suspects are Ratanlal, who cannot furnish an alibi, Kamala, who insists on being the murderess, ex-convict Sukhdev, who confesses to the murder claiming robbery to be the motive, and the lunatic Tarachand, who also admits his guilt.