Kathiresan aka Kaththi, a criminal, escapes from the Kolkata prison and comes to Chennai, where he comes across his doppelganger Jeevanandham, fighting for his life after being shot at by unknown men. Kathir decides to pass off as Jeeva and make away with a lump sum amount but once he realizes who Jeeva really is, Kathir turns a crusader.
Vishwanathan, a Kathak dance teacher in New York, is happy in his marriage with Nirupama, a nuclear oncologist who married him to pursue higher studies in the USA. Deciding to cut ties with her husband, Nirupama hires a private detective to monitor his activities. To her utter shock, certain truths about her husband are subsequently revealed, setting off a chain of events that will change both of their lives irreversibly.
The Chola kingdom is under threat from forces both internal and external, and with crown prince Aaditha Karikalan, his younger brother Arunmozhi Varman and the emperor, Sundara Cholar separated by situations, it is up to a messenger to ensure the safety of the kingdom. Can he succeed in his mission, especially with Karikalan's former girlfriend, Nandhini, plotting to bring down the entire Chola empire?
