[3][4][5] The plot revolves around the life in a typical, Malayali household named Shanthi Nilayam - consisting of four brothers: Nandakumar, a Hindi teacher in the local school, Krishnakumar, a court office clerk, Gopakumar, a medical representative and Chandrakumar, a college student.
The family is headed by their father, Munshi Parameshwaran Pillai, a widowed veteran Gandhian teacher respected by everyone in their village, who also home schools his grandchildren.
But otherwise, the household is a happy, peaceful and satisfied one until the arrival of their new neighbor, who is an irresistibly charming and beautiful South Indian film heroine Yamuna Rani.
Soon, trouble starts to brew when the loan with which they bought their new household items in order to impress Yamuna Rani needs to be paid back to the moneylender.
The trouble further escalates when the ladies, each, receive a letter from an anonymous identity, which claims that one of the three men are having an extramarital affair with Yamuna Rani.
Yamuna Rani recovers later and testifies that it was not because of the husbands, but because of her foster mother Santhanavalli, who was pressurizing her to act inappropriately in a certain movie, that led her to attempt suicide.
In the end all's well - Yamuni Rani heading back to her illustrious career taking with her the love and affection shown by the members of Shanthi Nilayam and the families decide to support the relationship between Chandrakumar and Asha.