Santosham

Kabhi Andhera Kabhi Ujala is a 1958 Hindi film starring Kishore Kumar and Nutan.

Kamal, a governess, falls in love with Ashok. Things, however, take an odd turn when Ashok marries her friend, Radha. Soon after the marriage, Radha meets with an accident.

While returning home via train, Purnima gets sexually assaulted by a stranger, keeps it to herself, but her parents eventually find out and the shock kills her dad. Since it was too late to abort the baby boy, her mother gives it away to a stranger. Purnima gets married to her sweetheart, Vijay, a Chief Engineer, but ironically the very same child ends up in their care, and they name him Rajan. Years later, Purnima gives birth to Aman. The two boys grow up, siblings rivalry prevails to such an extent that eventually they end up falling in love with the same woman, Meena. Things keep on getting complicated so much so that a member of their family ends up getting killed, and another getting arrested.

Ajay alias Munna Babu is a semi-senile, gentle but naive young man who has a wealthy family estate. His employees and alleged well-wishers conspire against him and introduce him to his long-estranged mother, Shakuntala, and brother, Vijay. Munna is overjoyed, not knowing that they are devious impersonators. This joy is quite short-lived, as they soon show their true colors, and Munna gets killed. His restless spirit seeks out his real brother and appeals to him to avenge his death. Vijay, at first, thinks he is hallucinating, but when his mother confirms that he indeed had a twin brother, he agrees to accompany Munna's spirit back to where he was killed, and thus assist him complete his vengeance. Things do not go as planned, and Vijay himself becomes their victim, and may face the very same fate as Munna.

A thief steals from the rich and gives to the poor

Vijay helps the poor and robs the rich, while Ajay is assigned the job to bring Vijay to justice. Thirsty for each other's blood, both men are unaware that they are brothers separated at a young age.

Quest of Asha and her mother Laxmi to get justice in a corrupt society