- A murder-mystery/thriller, in which the friend of a wealthy, elderly couple tries to bring about a reconciliation between them on the one hand, and their their estranged relatives on the other.
- This is a whodunit murder mystery that takes place entirely in an island. The island consists of a big mansion that belongs to a rich lonely old man (Dayanandham) and his mentally challenged wife (Ponni). Other than the couple and the servants in the mansion, there are no other people living in the island. Everyday the ill husband takes food to feed his wife who is confined upstairs. They have no offsprings.
One day the island is visited by their family doctor and close friend (Dr. Saravana) who brings the bad news that Dayanandham has blood cancer and has approximately only 20 days to live. Dayanandham is shocked and also saddened that there will be no one to take care of his wife. The doctor also informs him that he has invited all his siblings to the island in 3 days so that Dayanandham can have all his family members around him during his last days. But this angers Dayanandham who blames his siblings for the mental state of his wife. Dr Saravana convinces Dayanandham to allow his relatives to stay in the mansion.
Jan 12. An unhappy Dayanandham watches as his siblings enter the mansion one by one along with their family. 1) His eldest brother, Gopanathan. Gopanathan's daughter, Leela and son-in-law, Rangarajan. 2) His deceased brother's wife, Mohanambal. Mohanambal's son, Ginger. 3) His younger sister, Vadivambal. Vadivambal's elder son, Aravindhan* and younger son, Kalyanam. 4) His younger brother, Neelamegam. Neelamegam's wife, Sivakami and daughter, Anuradha 5) His youngest brother, Jambulingam who is blind and in a wheel chair. Jambulingam's daughter, Raagini.
All of them apologize to Dayanandham but he storms out of the drawing room after declaring that he will not leave them any money after his death. All of them contemplate to leave but Dr Saravana requests them to stay and asks them to be nice to Dayanandham. Ponni secretly watches all of this from upstairs. The servants are introduced by Dr Saravana to the guests. The cook, Joseph. The butler, Mose. The bald henchman, Mottayan who is dumb and his housekeeper daughter, Pankajam. All siblings and their family are assigned separate rooms upstairs. Dr Saravana also stays in the mansion.
During night, many odd things occurs which unnerve the guests. Mohanabal sees the room door open suddenly. She sees Mottayan on the other side and gets frightened. Kalyanam gets scared by a ghostly figure on the wall which turns out to be his own shadow. The guests hear music coming from the living room downstairs. When Aravidhan and Raagini go to investigate, they see the sound coming from the piano without anyone playing it. Meanwhile, someone throws a scorpion on a sleeping Jambulingam but Aravindhan comes back in time and saves him. After a while they hear the same music again. When everyone goes to find, they see Dayanandham playing the piano for his wife, Ponni. Raagini sings a song to the tune and Ponni develops a liking for her. Everyone goes back to bed.
Jan 13. Everyone arrives to have breakfast. Mohanambal is not present and her son informs that she went out for a walk and will be back soon. During breakfast, she is found laying dead under the dining table. She has been strangled in the neck by someone. Mottayan, Dayanandham, Dr Saravana and Ponni are all suspected by the guests. Though many of them want to leave the island, Dayanandham and Dr Saravana refuse stating that they don't want the murderer to escape. The boat in the island is suspended and the guests are warned of crocodiles in the lake surrounding the island, lest they try to escape by swimming.
That night, Vadivambal overhears Dr Saravana and Dayanandham discussing about a secret room where all the money, gold and jewelries are kept. Raagini visits Ponni and feeds her food which impresses Dayanandham.
Jan 15. At night, all guests hear a loud sound. Gopanathan goes to investigate. Later, Gopanathan is found hanging in the corridor. Though a suicide letter is found, Dr Saravana informs that Gopanathan was infact poisoned from the milk he drank before he went out of the room to investigate. Though the butler is suspected at first, it is found that the milk had been placed near the room window and hence anyone could have added the poison.
Jan 16. All the guests request Dr Saravana again to allow them to leave the island. Dr Saravana convinces them that they will get part of Dayanandham's money if they are willing to stay a little longer. Vadivambal informs her son, Kalyanam and Ginger about the secret room and they both decide to steal the money. After stealing, they plan to kill Mottayan with one of Dayanandham's gun and then escape in the boat.
Jan 18. At night, while trying to steal, they find the dead body of Vadivambal inside the secret room. She has been poisoned by an overdose of morphine. Dayanandham suspects that the murderer must be his brother, Neelamegam since he has clashed with him from the beginning. Dr Saravana also agrees stating that Neelamegam is a country brute. But no evidence is found.
Dayanandham requests his blind, wheelchair bound brother, Jambulingam to leave the island because of his incapacity to fight the murderer if he becomes a target. But Jambulingam refuses to leave the island without his daughter, Raagini.
Jan 21. At breakfast while everyone is talking about Dr Saravana not being present at the table, they notice that Ginger has been stuck by a knife to his back by someone without anyone noticing it. With Dr Saravana arriving at the table unharmed, Dayanandham suggests that the culprit is Neelamegam but Neelamegam disputes this.
At night, music is again heard from the living room. Aravindhan, Raagini, Rangarajan and his wife go and check the piano. They find a tape recorder inside the piano and realize that someone is trying to scare them.
Jan 23. At night, Neelamegam tries to escape from the island but is shot dead by the murderer with a shotgun before he can get into the boat. After finding about the latest murder, Dr Saravana wants Dayanandham to let everyone out of the island since he doesn't want any more deaths. Dayanandham refuses stating that he is determined to find the murderer.
Jan 25. At night, while asleep in her room, Raagini hears shouts from her father, Jambulingam that someone is taking him away. She runs into the corrider to find someone pushing the wheelchair of her father. Looking from behind, she is certain that it is the doctor. As she comes closer, the murderer brandishes a knife. Jambulingam asks her to go and get help. When she goes away, the murderer pushes the wheelchair from the top of the stairs. As everyone arrives, Jambulingam is on the floor below but still alive. As they care for Jambulingam, Raagini blames the doctor. Dayanandham refuses to believe that his good friend is the murderer. Even Jambulingam agrees that it might not be the doctor who tried to kill him. Dr Saravana arrives and is unaware of anything that happened. Jambulingam believes that someone is trying to frame the doctor as the murderer. Ponni silently watches this from upstairs. Everyone goes back to their rooms and Raagini takes her father upstairs in the wheelchair. She leaves him alone to get food for him. Meanwhile Ponni is seen walking through the corridor. She goes to the balcony and starts admiring the lake. Someone comes up from behind and pushes her from the balcony.
Dayanandham is devastated by his wife's demise. Everyone mourn her death. Dayanandham tells them that he is going to leave all of his wealth to Raagini after his death since she was the one who was close to his beloved wife. All remaining relatives are angry and shocked.
Jan 26. All the guests discuss the situation. Jambulingam acknowledges that after thinking about the incident the day before, the person who pushed him from the stairs could have been Dr Saravana. He suggests that the doctor may have wanted to eliminate all of Dayanandham's relatives before his death. This way, if Dayanandham leaves his money to the doctor, then there will be no one else to claim it. The doctor secretly listens to this conversation.
Raagini goes to Dayanandham's chamber and asks him to distribute all his wealth equally among his remaining relatives but he refuses. Dayanandham requests Raagini to sing the song which was the favorite of Ponni. While Raagini plays the song in the piano, we see the murderer with the knife climbing down to stairs to kill Raagini. As he comes up behind her, she notices his shadow and turns back. She recognizes the masked person as Dr. Saravana. Before he can strike her, Dayanandham shoots the serial killer from upstairs with his pistol. All of them arrive on hearing the gun shot. Though Dayanandham is surprised that it is his doctor-friend, he is satisfied that they have caught the murderer.
While everyone starts discussing the situation and the murderer is writhing in pain, Dr Saravana (played by director S.Balachander) comes out of his room upstairs wondering what all the commotion is about. Everyone is shocked on seeing him. They all run to the murderer and remove his mask. It is revealed to be Jambulingam.
Before dying, Jambulingam reveals that he is neither blind nor lame. He admits that he killed the all the people because he wanted to get more of Dayanandham's wealth for himself. He faked his fall from the stairs to mislead everyone about the murderers identity. When Dr Saravana asks why he tried to kill his own daughter, Raagini reveals that she is not his daughter. She is infact a nurse in the hospital whether Jambulingam was admitted. She was also tricked by Jambulingam about his disability. She agreed to come to the island to take care of him. She also reveals that Jambulingam had lied to her that if she didn't come as his daughter, then he wouldn't be accepted by Dayanandham. She apologizes to Dr Saravana for suspecting him.
Jan 27. Dayanandham is on his death bed. As per the request of Raagini, he distributes all his wealth among the remaining people in the mansion and dies.
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