Yaar Nee?

On a rainy night, the highly reputed Dr. Anand (Jaishankar) is driving. He sees a mysterious woman standing by the road and gives her a lift. She introduces herself as Sandhya (Jayalalithaa). As soon as she steps into the car, the wipers eerily stop working. He's even more spooked when the lady shows him the way when the path is barely visible. The mysterious woman guides him outside a cemetery. On reaching the cemetery, the gates open automatically and Anand hears a song, "Naane Varuven Ingum Angum".

Dr. Anand is about to inherit a large fortune from a distant relative with the clause that he is mentally sound. The writer of the will laid this condition as there had already been case of mental instability in his family. His colleague Dr. Latha (C. Lakshmi Rajyam) loves Dr. Anand, but he already has a girlfriend, Rama (Kumari Radha). The mystery unfolds when Rama is killed by a Cyanide injection and the suspects are Dr. Latha and her father Dr. Giri (S. V. Ramadoss), the head of the hospital in which Anand and Latha work.

On a stormy night, Anand is called to a dilapidated mansion on an emergency case. There, he comes to know that the patient has already died. He is surprised to see that the patient is none other than the mysterious woman he met on the rainy night, Sandhya. As he leaves the mansion, he meets some policemen who tell him that the mansion has been deserted for a while and it is rumoured to be haunted. The policemen inform him that what he saw in the mansion happened years ago and many doctors have registered similar cases with the police on stormy nights. Meanwhile, Anand's mother appointed a new man servant named Madhavan (Veerappan) and a new maid, named Thamarai (Manorama). On another occasion, Anand reads a newspaper article about a train accident in which he sees a picture of a woman who died and that happens to be Sandhya again.

Anand is very unhappy after the demise of his girlfriend. His mother fixes an arranged marriage to a girl recommended by her sister. On the wedding night, Anand is shocked to see that the bride is none other than Sandhya. He starts avoiding her. One day, he sees that she has painted the same bungalow in which he was called on that rainy night. Just after that, he hears her singing a part of "Naane Varuven Ingum Angum". On another night, Sandhya visits Anand's hospital and tries to impress him with her charm and beauty.

Anand attempts to know the truth behind Sandhya by taking her on a ride in his car. He gets his wipers to stop working and asks her to guide him as she can clearly see the way in the stormy and foggy night. He takes her to the bungalow and to the exact spot where he had seen her dead. As he explains what happened on the stormy night, Sandhya disappears. When Anand reaches home, she is waiting for him and his mother says that she never left the house.

Shocked by everything that is happening around him, Anand finally persuades his mother to let Sandhya go back to her home. The next day, he comes to know that the train Sandhya travelled in met with an accident. As another twist, Anand finds Sandhya on his terrace that same night.

All these mysterious happenings take a toll on his mental health and he is advised to take some rest in Ooty. There, he meets a monk (O. A. K. Devar) atop a hilltop, who tells him that 100 years ago at this very spot, a boy and girl were romancing when the girl fell and died. Since then, her spirit has been roaming the hills awaiting her lover to return. The priest says that the spirit believes that her lover has been reincarnated in Anand's form. Anand then sees Sandhya from the foot of the hill as she sings the last part of "Naane Varuven Ingum Angum". Persuaded by the priest's words, Anand jumps from the hill, but, is saved by Latha. Later, when Anand sees Sandhya trying to lure him out, he follows her to the same old bungalow, where he sees Sandhya on the stairway in one moment and then impossibly beside him in another.

She lures him to the roof, where suddenly he sees a duplicate of Sandhya. The duplicate shouts that she is the real Sandhya, but she is gagged and taken away. Strengthened by his sudden revelation, Anand realizes the woman is actually not a ghost and confronts her, but, she accidentally falls down and dies. Then, comes Ramesh (C. L. Anandan) Anand's cousin. He reveals that this was his plan so that his inheritance would pass to him, as he is the next in line to inherit the property. A duel follows between them and police arrive. The other woman was Sandhya's twin sister Mohini, whom Sandhya didn't know, but Ramesh came to know it by chance. Sandhya's parents separated them years ago. When her father died, Mohini was forced to adopt unfair means for her living and Ramesh guided Mohini, teaching her to mimic Sandhya's behavior. The Sandhya who had lured Anand from the hospital was actually Mohini. This explains Sandhya's presence in two places at the same time. Hence, the mystery is solved. Sandhya and Anand are united.

• Jaishankar as Dr. Anand
• Jayalalithaa as Santhya/Mohini (Twin Sisters)
• C. L. Anandan as Ramesh (Anand's distant cousin)
• C. Lakshmi Rajyam as Dr. Latha
• S. V. Ramadoss as Chief Dr. Giri (Latha's Father)
• B. V. Radha as Rama (Anand's girlfriend)
• Manorama as Thamarai (Maid)/Sulakshana (C.I.D Officer)
• A. Veerappan as Madhavan (Anand's house new servant)
• Pushpamala as Valli (Rama's house maid)
• O. A. K. Thevar as Saint
• C. K. Saraswathi as (drama artist) as ghost mother
• K. Malathy as Anand's Mother
• P. S. Veerappa as Guest

The music was composed by Vedha and lyrics were written by Kannadasan.[3][4]

• Yaar Nee? on IMDb