Nadu Iravil ( ) is a 1970 Indian Tamil language-language crime thriller film, directed and produced by S. Balachander. The film's story was written by him and dialogue was written by Ve. Laxmanan, who also composed the music. It is based on Agatha Christie's 1939 novel And Then There Were None.
During the next few days, Dhayandam's relatives are murdered one after the other. Remaining guests start blaming Ponni, Dhayanandham and Saravanan and want to leave the island, which does not have any means to communicate with the outside world. But Dhayanandham says that won't be possible without his permission and forces them to stay until the killer is found. Saravanan asks Dhayanandham to distribute his wealth to his siblings, but Dhayanandham refuses to cooperate until the killer is found.
Jambu is Dhayanandham's youngest brother who has lost his legs and eyes in the military. Ponni and Dhayanandham take a special liking to Jambu's son Ragini. Dhayanandham permits Jambu to leave the island, but Jambu refuses. The next night, Ragini sees a mysterious man who looks like Dr. Saravanan from behind, push her dad Jambu with his wheel chair down the stairs. Jambu survives the fall and Ragini accuses Dr. Saravanan. But everyone, including Jambu himself, say the killer must have been someone else who looks like Dr. Saravanan from behind. The same night, someone pushes Ponni from the rooftop and kills her. A completely distraught Dhayanandham declares he is willing all his wealth to Rangini.
Dhayanandham asks Ragini to play the piano to calm him down. And when she is playing, the masked killer in Dr. Saravanan's clothes tries to stab her from behind. But Dhayanandham shoots the killer down. Rest of the family is all relieved that the killer is dead, when the Doctor appears at the top of the stairs, surprising everyone.
Ragini unmasks the killer and it is revealed he is none other than Jambu. Before dying, Jambu confesses he was neither a cripple nor blind, and Ragini is not his daughter but just his nurse. He carried out all the killings so that he could be the only person remaining to inherit Dhayanandham's wealth. He had asked Ragini to act as his daughter saying that was the only way Dhayanandham would allow her inside his house.
Per Ragini's request, Dhayanandham splits his wealth to all his siblings and his servants, and succumbs to his disease.
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