In the city of Chennai, a
mysterious man known as 'Blackie' (played by Vidyut Jammwal) has been terrorizing the city's underworld figures. He seems to be always one step ahead of the police, leaving behind a trail of cryptic clues and taunting messages. The police force is baffled by his methods and motives.Enter CIB Inspector Mathivanan (played by Suriya), a tough and intelligent cop who is determined to catch Blackie. Mathivanan's obsession with Blackie grows as he becomes convinced that the latter is a former cop who turned rogue. However, Mathivanan's investigation is hindered by his own troubled past and the lack of support from his superiors.Meanwhile, a young and ambitious journalist, Keerthi (played by Keerthi Suresh), starts investigating Blackie's past, convinced that she can uncover the truth behind his identity. Her investigation leads her to a former cop, Michael (played by Karthik), who had been involved in a high-profile case. However, Michael's past comes back to haunt him when it is revealed that he had orchestrated the murder of a key witness, which led to the acquittal of the accused.As Keerthi delves deeper into the case, she realizes that Blackie's true identity is Michael, who is seeking revenge against the corrupt system that failed to punish him for his crimes. Blackie's methods become more and more brutal, and Mathivanan is forced to confront his own demons in order to stop him. However, as
the investigation unfolds, it becomes clear that nothing is as it seems, and that Blackie's true motives may be more complex than Mathivanan initially thought.The movie builds towards a thrilling climax as Mathivanan and Keerthi finally uncover the truth behind Blackie's identity and motive. However, just as they think they have solved the case, they realize that the truth is far more sinister than they had imagined. The movie ends on a cliffhanger, leaving the audience wondering what will happen next.Throughout the movie, the characters of Mathivanan and Keerthi are well-developed and complex, with their own motivations and backstories that drive the plot forward. The movie also explores themes of corruption, revenge, and the blurred lines between right and wrong. The action sequences are fast-paced and intense, and the plot twists will keep the audience on the edge of their seats. Overall, 'Thaanaa Serndha Koottam' is a gripping thriller that will keep you guessing until the very end.