Dharmalinga Mudaliyar, a cunning man who appears as a noble to the outside world. Rangam, his virtuous and long-suffering wife. Dharmalinga also has an eye on his sister-in-law Thangam. In order to marry Thangam and get control of the abundant wealth of the sisters, Dharamlingam ensures that everyone believes that Rangam is possessed by some evil spirit and is slowly becoming insane.