A CBI diary entry) is a 1988 Indian Malayalam-language mystery thriller film directed by K. Madhu, written by S. N. Swamy, and starring Mammootty, Suresh Gopi, Jagathy Sreekumar, Mukesh, and Sukumaran.

The film was remade in Telugu as Nyayam Kosam with Rajasekhar and in Hindi as Police Public with Raaj Kumar.

[6] Oru CBI Diary Kuripp ran for a whole year (365 days) in Tamil Nadu at a time when Malayalam films did not find much of an audience in the neighbouring states.

Sunny admits to arguing with Omana the previous night and pushing her onto their bed before leaving to drink but swears he never hit her.

Ouseppachan claims that he came home from a business trip that night, dropped off by his driver, Vasu, only to find himself locked out of the house.

He also finds the autopsy report suspicious and tells higher officials Varma and Alex why he has doubts about its accuracy.

He informs them that it rained severely until 9:30 P.M. Omana allegedly committed suicide, and if she had died at 8:00 P.M., her corpse would have been wet, and the blood from her injury would have been mixed in with the rainwater.

Iyer and his team commence the investigation and find evidence of political interference in the investigation, an increased amount of phone calls to Ministers and Party Leaders from Narayanan's phone number, and ₹1000 rupees worth of cash withdrawals from Ouseppachan's bank that were never reported in the books.

They find that Omana's body landed in approximately the same place as the dummy that was thrown, and concluded that she could not have jumped that far off the roof on her own.

It was during a moment alone with Omana's dead body that Vasu noticed her gold bracelet and decided to steal it, before throwing her corpse off the roof.

However, Iyer examines photographs of the crime scene and finds that Omana still bled when she was dropped off the roof some 2 hours later, and since dead bodies do not retain heat thus causing the blood to clot, she could not have died at 8 pm.

Since the autopsy report stated that she sustained no injuries below the waist, Iyer is convinced that the blood was left behind by the real killer.

Seeing his father being arrested for a crime he committed, a guilt-ridden Sunny confesses to Iyer that he killed Omana accidentally by hitting her too hard when they fought.

The plotline of the film was crafted around the real-life Polakkulam Case in which a hotel employee was murdered and dropped from the terrace to make it look like a suicide.

[15][16][17][18][19][20][7] The film was remade into Telugu as Nyayam Kosam in 1988, directed by Ravi Raja Pinisetty and starred Rajasekhar.

[21] The film was again remade in Hindi as Police Public in 1990 and was directed by Esmayeel Shroff and starred Raaj Kumar as CBI Officer Jagmohan Azaad.

Renu Saran in her book, History of Indian Cinema, called the film a "landmark" and wrote, "It bought to fore a new concept of villainy and a refreshing idea of a hero.

Without even a single song or dance number, Oru CBI Diary Kurrippu created box-office history in Kerala.

But the epic Sethurama Iyer series adopted a new approach, building a narrative for you to empathise with the victim while using cinematic elements as punch lines and background music to enliven the solving of the crime.