Shanker(Dharmendra) and Suresh(Deven Varma) were cousins. Shanker, the only son of rich Zamindar, not fond of books but the book of life. Suresh, an orphan and the only son of Zamindars dead sister, educated and very fond of books. They were less of cousins but more of friends and Shankers love and trust for Suresh knew no bounds. When a marriage broker suggested Madhumati(Sharmila Tagore), " a girl like Sita" for shanker and the book-mine Shanta(Shashikala) for Suresh, the friends made a strange. " You go to see the gil on my behalf" each told the other. When Suresh saw Madhu, he was enraptured. He decided to betray his friend so that she could be his. And the two cunning annonymous letters he wrote, resulted in his marrying Madhu, and Shanker marrying Shanta. On the wedding night itself the impetuous Shanta hurled words at her uneducated husband. Shanker's life became miserable and Madhu could not see the plight of her Devar and did her best to bring Shanta closer to him. Shanker, with an unhappy present, often rememebered his childhood days and his childhood sweetheart, Bhanvria, who after parting suddenly learnt that his beloved Bhabhi was Bhanvria herself! He begged God to help him maintain the sacred relationship of Devar and Bhabhi, to retain the peace in the home of his friend who had actually betrayed him! That was not all. Shanker bore more insults from his wife as the author of the annonymous letters. His own father who disinherited him. he was hated and misunderstood by all. But truth cannot be hidden for long and one day Shanker suddenly learnt that the man who had wrecked his life was not other than his own friend!