Rajakannu and Sengeni are a couple from the oppressed Irula tribe who labour in the fields of upper caste men to control rat infestation and catch venomous snakes. Rajakannu is called to a rich man’s dwelling to catch a snake. The next day, a case of burglary is reported against him. The police brutally beat and unlawfully detain the pregnant Sengeni. Later they imprison Rajakannu. Sengini turns to human-rights lawyer Chandru, who makes shocking discoveries to help them get justice.