The unit is tasked with capturing Perumal aka Vaathiyaar (Vijay Sethupathi), the popular leader of a rebellious outfit that protects the rights of indigenous people in the hills.
It is under these circumstances that, Kumaresan saves an old woman fighting for her life by dropping her and her granddaughter Tamilarasi (Bhavani Sre) at a hospital in his police jeep.
Like almost every other Vetrimaaran film, this story, too, is told with a lot of heart and passion. The film is based on Thunaivan, a story of eminent writer B Jeyamohan.