Story

Mithran, an efficient IPS officer, sets out to expose the illegal medical practices of Siddharth Abhimanyu, an influential scientist, and bring him to justice.

‘Thani Oruvan’ rewrites the old adage 'Show me your friends and I will tell your character' to 'Find your enemy to know your capacity'.  The entire screenplay is threaded on this line which as Mohan Raja claimed in his interviews is truly an entirely new concept.

Mithran (Jayam Ravi) and his group of friends are IPS officers in probation who embark upon a secret night journey to nib the crimes happening in the city. While others in the group get frustrated after knowing that the criminals they nabbed by risking their lives get scot free due to the loopholes in the system. However Mithran has his own secret mission. With his research he has already identified that the most of the small crimes are the starting points of a big conspiracy and he decides to destroy the perpetrator of one such conspiracy so that at least a hundred criminals would be killed.

In his search for such a mastermind he discovers Siddharth Ambhimanyu (Aravind Swamy) the Padma Sri award winning scientist as the mastermind of a huge conspiracy in pharmaceutical industry and also the one having a clout in real estate and minerals mafia.

The rest is what may be called as one of the most engaging games between the clever Siddharth and the cleverer Mithran unfolding onscreen.