In the village Ammapatti, Maruthu Pandi is a coracle operator in the day and the village protector at night. The villagers give him food in exchange for his work. Maruthu Pandi has a mentally ill sister Lakshmi who is pregnant and he takes care of Lakshmi like a mother. Kanagavalli is a dancer performing in a dance troupe. After performing their dance in Ammapatti, the dancers leave Kanagavalli alone. The villagers help Kanagavalli to stay in the village : they build a house for her. Kanagavalli slowly falls in love with Maruthu Pandi. Kanagavalli is, in fact, a police officer who wants to arrest Maruthu Pandi. Maruthu Pandi's real name is Manickam.

In the past, Manickam was a poor tailor, where he lived happily with his only sister. Manickam was in love with Kavitha, daughter of a rich zamindar. Her father Jagannathan refuses to let his daughter marry Manickam; instead he wants to get her married to a zamindar like him : Inspector of Police Thiagarajan. On the day of the wedding, Kavitha drinks poison and dies. That same night, Jagannathan, Thiagarajan and Thiagarajan's friend Pradeep beat up Manickam and abduct Lakshmi and she is brutally raped by Thiagarajan. Manickam manages to beat up them while Jagannathan,Kavitha's father is killed in the process and Lakshmi becomes mentally unstable. He flees the village with his sister from that village.

Thiagarajan and his police team come to Ammapatti to arrest Manickam. What transpires later forms the crux of the story.