C. N. Annadurai

A thief breaks into a wealthy man's house unaware that the man is his father, who had abandoned his mother and him a long time ago.

Nallathambi (NSK) a simple rural man inherits an estate from his deceased Zamindar relative. The Zamindar's daughter Pushpa (Bhanumathi) falls in love with Nallathambi. However he loves another girl (T. A. Madhuram). Bhoopathy (Sahasranamam) the estate manager has his eye on the wealth and tries to cheat Nallathambi out of it. He goads Pushpa into filing a suit that Nallathambi is mentally insane. In the end Nallathambi defeats Bhoopathy's machinations.