The Mirzas are a Muslim family living in a large ancestral house and running a shoe manufacturing business in the city of Agra in the United Provinces of northern India (now the state of Uttar Pradesh). The story begins in the immediate aftermath of India's independence and the partition of India in 1947. The family is headed by two brothers; Salim (Balraj Sahni), who heads the family business, and his elder brother Halim, who is mainly engaged in politics and is a major leader in the provincial branch of the All India Muslim League, which led the demand for the creation of a separate Muslim state of Pakistan. Salim has two sons, the elder Baqar, who helps him in the business, and Sikander (Farooq Shaikh), who is a young student. Halim's son Kazim is engaged to Salim's daughter, Amina. Although he had publicly promised to stay in India for the sake of its Muslims, Halim later decides to quietly emigrate to Pakistan with his wife and son, believing that there was no future for Muslims in India. Salim resists the notion of moving, believing that peace and harmony would return soon, besides which, he has to care for their ageing mother, who refuses to leave the house of her forefathers. This puts Kazim and Amina's marriage plans on hold, although Kazim promises to return soon to marry her. Halim's stealthy migration affects Salim's standing in the community. In the aftermath of partition, the sudden migration of many Muslims from Agra left banks and other lenders deeply reluctant to lend money to Muslim businessmen like Salim Mirza, who had previously been held in high esteem, over fears that they would leave the country without repaying the loan. Unable to raise capital to finance production, Salim Mirza's business suffers. Salim Mirza's brother-in-law, formerly a League supporter, now joins the ruling Indian National Congress in an attempt to get ahead in independent India, while his son Shamshad unsuccessfully woos Amina, who is still devoted to Kazim and hopeful of his return.