If you are looking for a on that film, here is a draft: Title: Nooravathu Naal (1984): A Landmark Horror Thriller and Sathyaraj's Understated Role

Nooravathu Naal remains a cult classic. While often remembered for its chilling atmosphere and Saritha's performance, Sathyaraj's contribution as the steadfast investigator is crucial to the film's narrative structure.

The film was a major commercial success and is credited with inspiring later Tamil horror films like Uruvangal Maralam . Sathyaraj's role proved his versatility early in his career (he had debuted only a few years earlier in Oru Kaidhiyin Diary ).

This is not a standard or famous film title. The closest well-known Tamil film is (நூறாவது நாள் — The 100th Day ), a 1984 horror-thriller directed by Mani Bharathi, starring Sathyaraj , Saritha, and Nalini.

Nooravathu Naal (100th Day) is a significant film in Tamil cinema history for pioneering the horror-thriller genre with a strong whodunit element. Directed by Mani Bharathi, the film cleverly uses the superstition surrounding the "100th day" after death to build suspense.

It seems you are referring to the Tamil phrase (நூறாவது நாள் சத்யராஜ்).

Unlike his later larger-than-life, comedic or angry-young-man roles, Sathyaraj delivers a restrained, naturalistic performance here. He anchors the film's rational perspective, providing a necessary counterbalance to the supernatural elements. His chemistry with the other leads and his methodical unraveling of the mystery are highlights.

The film follows Geetha (Saritha), who is murdered. Her spirit is believed to be active until the 100th day. The film's tension revolves around whether her spirit will identify the killer. Sathyaraj plays Inspector Rajasekhar, a rational, no-nonsense police officer initially skeptical of supernatural claims but forced to confront them as the investigation proceeds.