Oru CBI Diary Kurippu
The films depicts a team of CBI officers led by Sethurama Iyer investigating into 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
Starring Mammootty, Urvashi, Mukesh, Suresh Gopi, Jagathy Sreekumar, Janardhanan, Prathapa Chandran, Sreenath, Lissy, Sukumaran
Watch "Oru CBI Diary Kurippu" on Amazon released in 1988. It's a crime and thriller movie, and has a rating of 8.1 out of 10 from Imdb which is very high for this kind of movie, and is currently only available for purchase or rent.