ഒരു സിബിഐ ഡയറി കുറിപ്പ് is a 1988 Malayalam film directed by K Madhu, scripted by S. N. Swami, and starring Mammootty, Suresh Gopi and Jagathy Sreekumar.This film is the first in the series of the CBI investigative thrillers featuring Mammootty as CBI officer Sethurama Iyer. Sequels to the film are Jagratha (1989), Sethurama Iyer CBI (2004), and Nerariyan CBI (2005). A fifth sequel in the franchise has been announced and is now in the pre-production stage.[1]
The plot-line of the film, Oru CBI Diary Kurippu, was crafted around a real life incidence, the Polakkulam Case in which a hotel employee was murdered and dropped from the terrace to make it look like a suicide. The case was investigated by the CBI and it was in this case that a humanoid dummy experiment was first done in the state of Kerala to prove a murder case.
The lead character, Sethurama Iyer is said to have been inspired by a police officer named Radhavinod Raju, who in 2009 was appointed as the first chief of India's National Investigation Agency.[2][3]
The movie was a huge boxoffice success. The background score of the film became quite popular, and years after the release of the first two sequels, became popular as mobile phone ringtones. This was one of the reasons that led the filmmakers to plan a third sequel after 15 years. All the sequels use the same background score, composed by music director Shyam.