Sethurama Iyer CBI
Sethurama Iyer CBI is a 2004 Malayalam-language mystery crime film directed by K Madhu.The movie is written by S. N. Swami, and The movie stars Mammootty in title role. Actors Mukesh and Jagathy Sreekumar played important supporting roles. Shyam composed the background score for the film. This film is the third in the series of the CBI investigative thrillers featuring Mammootty as CBI officer Sethurama Iyer.This film was a Blockbuster and was the highest-grossing film of the year collecting around distributors share of ₹4 crore and a gross around ₹10 crore The success of this movie made Mammootty "Man of the year" The base story and initial scenes are adopted from Arthur Hailey's Novel Detective. Some of the scenes of the movie are also loosely based on the 2001 Aluva massacre. Plot 
The movie begins with Sethurama Iyer visiting Easow Easow Alex, a convicted serial killer who is awaiting his execution. Easow Alex was arrested and convicted for the cold-blooded murder of seven people in two different families. Easow Alex, who had been living a wild life then, had committed the crime high on narcotic drugs. The murder case was left to the CBI for investigation and an able officer, played by Siddique, nabbed Easow Alex in no time. Easow Alex is now a new man, mainly due to the influence of a priest, who requests Iyer to visit Easow Alex. What Easow Alex tells Iyer is startling; he didn't commit one of the seven murders he was convicted for. The murder was that of Manikkunju, a businessman. Manikkunju, along with his daughter-in-law Mosi, was murdered at his house. Easow Alex tells this all the same confessing that he murdered Mosi. The possibility of another killer involved is very remote and Easow Alex is a serial killer who thoroughly denied any hand in the murders when he was arrested, but yet Iyer decides to reopen the case and investigate. He faces many odds; to prove Easow Alex right would be proving his own bureau wrong and to prove Easow Alex wrong would be wasting time and money. 