The story based on the sensational Swathi murder case. Nungambakkam title refers to the railway station in Chennai where the 24-year-old software engineer Swathi was stabbed to death. Swathi was murdered when she was waiting for the train in the morning at the Nungambakkam railway station on June 24, 2016.

An encounter specialist learns the hard truth that all his encounter operations have been to safeguard the interests of corrupt politicians and businessmen. But before he can undo the damage, it is too late; and four innocents become collateral damage as well.