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A Turkish Interpol officer, Aslan Yilmaz investigates the assassinations of Chief Minister of Odisha, Mayor of France and Prince of Scotland, where he, along with a young Tamil criminologist Judith Samson, deduce that Cobra, a flawless assassin is the mastermind behind the assassinations. The duo learn that Cobra assassinates his targets using mathematical skills, leading them to believe that he is a professor of mathematics.Meanwhile, Mathiyazhagan "Mathi" is a mathematics professor, who is actually Cobra, receives his next assignment from his mentor and senior journalist in Kolkata, Nellaiappan. He is to kill the Russia's defence minister, Dmitri Yugolsav. He travels to Russia and manages to successfully assassinate him and escape, despite tight security from the Interpol. Before Yugolsav was killed, Aslan and his team watches a telecasted conversation between Nellaiappan and Nawab, who works at a company named Rishi Corporation, where he concludes that the victims are connected to the company's owner Rajeev Rishi, a psychotic and sadistic person, who inherited the company from his father. After his engagement to his criminalogist girlfriend and Judith's teacher, Bhavana Menon, Mathi learns that Nellaippan has been kidnapped and learns that someone has targeting him from the beginning of his assignments.