THE ENLIGHTENED

A woman named Vasantha finds her husband Ranganatha dead, where the masked murderer tries to kill her, but escapes. Vasantha is left in a state of shock and becomes mentally paralysed. A case is registered and the investigation takes place. Hema, a college student, arrives at her hometown for vacation with her friends. She lives with her three younger paternal uncles – Ranganatha, Rajashekhar and Chandrashekhar – and her aunt Vasantha. Hema parents had died years ago. A series of murders take place at Hema house with every time a cigar bit being left by the murderer intentionally. The cops suspect the visiting doctor, a Siddha doctor named Ram (who is close to Rajashekhar family)

Since Vasantha is the only eyewitness of the murderer, her life is in danger. Despite tight security, Vasantha is killed by the murderer, who frequently calls Susi and threatens that he is nearing her to kill her. Susi is frustrated by the incidents at her home and the threatening phone calls. Her lover Baskar promises to help. Baskar investigates Chandrashekhar, and later Rajashekhar; he follows him to a strange house and a woman who wanders like a ghost. She is actually Rajashekhar lover, who was rescued some years back by him when she attempted suicide. Rajashekhar kept quiet as he wants Hema to get married first, only then, would he marry his lover. Baskar sends everyone out of Hema house for a night to lure the murderer. As expected, he enters Hema room to kill her.

Baskar fights and tries to unmask the murderer, managing only to retrieve his mask and see his eyes before he escapes. Baskar finds Chandrashekhar murdered at the doorstep. Rajashekhar and Hema plan to vacate the house after celebrating Hema birthday party. On the day of the party, the murderer attacks Hema . Baskar chases him, but loses track. He sees Ram injured at a place, who claims that the murderer attacked him and fled. No one knows why the murders are happening and who kills every member of their family. Ram urges Rajashekhar to tell about his family which might help him find the identity of the murderer. Rajashekhar reveals that his father had an extramarital affair with a woman and they had a son, but the woman and her 10-year old son died 15 years ago, in a fire set by Rajashekhar elder brother (Hema father).

Baskar theorise that the son may not have died and is actually the murderer killing the family members as vengeance; he concludes that the murderer is present in the hall where all are gathered. Baskar places the murderer's mask on the faces of all the men in the hall to verify whose eyes match with the murderer's eyes, ultimately exposing Ram as the illegitimate son and murderer. Baskar chases Ram, who gets injured trying to escape; while he is struggling to run, the cops shoots him, but he disappears suddenly. Everyone finds a secret room beneath the garden which leads to Ram's house, and find him lying dead due to the gunshot, thus leading everyone to figure out that this is how he escaped after committing each murder. Baskar later marries Hema while Rajashekhar marries his lover.