Pilot Ashok (Sivaji Ganesan) is in love with Sivakami (Vanisri). They have an affair and Sivakami becomes pregnant. Ashok dies in a plane crash. Sivakami tells her father about her pregnancy. But soon he dies too. Sivakami is now on her own with her new born child whom she gives to a rich family to look after. She works there as a servant and she tells the rich person about her past. She emphasises that this must not be told to his wife who is fond of the child. He promises her that he wouldn't. Meanwhile, the wife's brother Ashokan sees Sivakami and wants to marry her. When she rejects his proposal, he tries to rape her. Her son kills him with a knife. The child runs away leaving Sivakami with the knife. Sivakami goes to prison as she confesses to the murder. She is released twenty years later. Meanwhile, the rich man's wife finds out about Sivakami's history from her husband. She is shocked and wants her to be immediately released from prison. Sivakami returns to their home. A girl ...