Aravindan(Nedumudi Venu) is an assistant manager in a tea plantation in Munnar. He lives with his wife Janu (Saritha) and three daughters. They follow a happy life until he comes to know that he is affected by lung cancer. The doctor suggests him to move to Tata Institute for further treatment. He informs Mammukka (Thilakan) about the same and leaves for Bombay lying to his family that he has been promoted to a manager. Meanwhile, Dr. Surendran(Mammootty) shifts to Munnar as the family's new neighbor. The youngest daughter of the family, Rajani (Meena) acquaints with him and introduces him to her mother. The flashback shows a romantic relationship between Surendran and Janu where their marriage was fixed. Surendran meets with an accident and becomes impotent. He convinces Janu to leave him and marry someone else. The present life shows how Surendran becomes closer to the family. Rajini suffers from a heart problem and Dr. Surendran becomes a helping hand for the treatment. Aravindan's health worsens in Bombay and he asks Mammukka to inform his wife about his ill health. Aravindan has a helping hand called Shankhu (T.G. Ravi) in the hospital. Aravindan dies in the presence of Janu in the hospital. Shankhu threatens Janu about informing the kids about their father's death which could cause Rajini, the girl with the weak heart to die. Janu comes back to Munnar and pretends that Aravindan is recovering and does not tell her kids about the death. Shankhu visits her now and again blackmailing for gold and money. As the last sort, he takes away Janu's marital gold chain and threatens to return it back only if he is given ten thousand rupees. Surendran knowing all truth about Janu comes to her rescue and beats up Shankhu. He surrenders to the police saying that he murdered Shankhu. Hearing the news Rajini becomes unconscious. The court leaves Surendran on bail to operate Rajani. After he returns, he is been sent out jail as the police receive a complain that Surendran is innocent. Janu confesses to the CBI, who is now handling the case, that she had murdered Shankhu. She had done so because Shankhu had tried to rape her and to save herself she does so. Police arrest her, but the court leaves her considering her circumstances for the crime. The movie ends on a happy note.
