The plot revolves around the life in a typical, Malayali household- consisting of four brothers- Nandakumar- A Hindi teacher in the local school, Gopakumar- A medical representative, Krishnakumar- A court office clerk and Chandrakumar- a college student (also the youngest), in order of their age. The first three brothers are married to- Kausalya, Indumati, Anandam; 3 naive, and shallow wives who adore their husbands dearly and whom the husbands equally love. The family is headed by their father, Munshi Parameshwaran Pillai, a veteran Gandhian teacher respected by everyone in their village, who also homeschools his grandchildren. The youngest brother Chandrakumar is in love with his to-be engaged fiancée, Asha, his cousin. Their relationship is oppressed by the family members because of a small feud between them. But otherwise, the household is a happy, peaceful and satisfied one until the arrival of their new neighbor- an irresistibly charming and beautiful South Indian heroine- Yamuna Rani. This turns the household upside down and sends the ladies into a frenzy. The ladies in order to please the superstar, glamourizes themselves, their husbands and the house. Thus, they form a formidable friendship with 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.With the arrival of the letter, which devastates the ladies, chaos ensues. The husbands are severely under pressure from their respective wives, who are trying to find out who that one person is. The distraught wives go to Yamuna Rani and plead, which leads her to attempt suicide. Thus the husbands are taken into custody by the local police on account of traumatizing Yamuna Rani. Later it is revealed that it was the Munshi, who sent the letter to the ladies to end their modus operandi. Yamuna Rani recovers later and testifies that it was not because of the husbands, but due to her own mother who was pressurizing her of 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 Shantinilayam.