As the eldest son of the family, Amir Khan has been working all his life to provide for the family. He is particularly fond of his brother Reza, and he supported Reza all through the latter's university years.
Reza is engaged to a girl named Sharife who, Amir Khan later finds out, has been having an affair with a man called Ahmad. Amir Kahn kills Sharife to save the family honor and ends up in jail.
On his release from prison after a 12-year term, Amir Kahn finds out that his brother, a university graduate in chemistry, is working at a restaurant, delivering food on a motorcycle to customers' houses.
Reza is now in love with Ladan, a girl student from a well-to-do family, and he has made marriage plans with her.
Disappointed and dissatisfied with Reza's conditions and his own relationship with his brother, Amir Khan starts looking for a job which is hard to come by for an ex-con.