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One ordinary day, the Chennai city police commissioner Raghava Maraar (Mohanlal) receives a threatening call on his mobile from a guy (Kamal Hassan), who claims that he has placed five bombs in various parts of the city. The veracity of the caller`s claim is confirmed when the cops find a bag with a RDX bomb at the Anna Salai police station.
The anonymous caller wants five hard core terrorists to be freed -- If not, he threatens blasts at various locations in Chennai where he has concealed the bombs. The chief secretary (Lakshmi) on the orders of Chief Minister has given a Maraar a free hand.
Maraar and his crack team of officers, led by a daring brooding cop Arif Khan (Ganesh Venkatram), gets ready to hand over the terrorists to the anonymous caller at an airfield. Further unfolds the stunning climax.