IG (Inspector General) Chandrasekhar, a senior IPS officer, (Mohanlal) is the head of the newly created Metro Crime Stopper Cell in Kochi. Chandrasekhar arrests Jerome, a psychologically deviant man, and rescues three girls he had kidnapped, but his ex-wife Deepthi (Priyamani), who is a lawyer, manages to get Jerome sent to treatment in a psychiatric facility, rather than a prison sentence. It turns out that the three girls had been mocking Jerome, which had led to his actions of kidnapping them in the first place.Grandmaster 2012
Chandrasekhar gets a congratulatory note from an anonymous man calling himself “Z,” who challenges Chandrasekhar to figure out how he is going to bump off one target after the other. Chandrasekhar is forced to investigate a string of murders: coffee shop owner Alice (Fathima Babu), famous singer Beena Thomson (Roma Asrani) and leading businesswoman Chandrika Narayanan (Seetha). These murders follow a mysterious alphabetical pattern, and each victim also has a cross slit on their forehead. Around the same time, Chandrasekhar’s daughter is preparing for a play under the lead of famous actor Mark Roshan (Arjun Nandhakumar).
Chandrasekhar divorced three years earlier because he discovered that Deepthi, his wife was using information from him for professional gain. Deepthi confesses to Chandrasekhar that the three recently murdered women were all involved in the murder of a man named Paul Mathew and made it look like a suicide. Chandrasekhar realizes that Deepthi is the next target and comes with her to their daughter’s play, where they meet a religious fanatic named Victor Rosetti (Babu Antony) who had been present in all three crime scenes, disguised as a salesman, and has been stalking Deepthi. The recurring theme of chess is obvious in the game between Chandrasekhar and the unknown Mr. Z.Chandrashekhar understands that there is a mastermind behind Victor Rosetti and decides to play a ‘queen’s gambit’ in his own words. Chandrasekhar finally manages to corner Victor on the rooftop of a theater, and Victor commits suicide by falling off the rooftop to the pavement.
