Habibollah Khan and his daughter Maliheh complain to Amir about his nephew Hashem. Hashem, a close friend of Amir and delaying his marriage to Maliheh, is involved in a devious plot. Amir, engaged to marry Azar and a driver for a mining company, carries the miners’ wages to the mine at the end of each month.
The daughter of a wealthy man marries a young Black man against her father's wishes. Shortly after, the woman dies during childbirth, and her husband is killed during a police chase. A little Black boy is the result of this marriage. The little boy meets a young man named "Reza," through whom he comes face to face with his grandfather.
Reza works in a poultry farm in Isfahan, and after he learns about his father's death, he goes to his father's house and retrieves the chimpanzee that belonged to his father. Reza meets a poor girl named Shirin, whose younger sister Mahnaz is ill and needs money for treatment. Reza discovers that in his father's will, which is hidden in the lining of the chimpanzee's jacket, it is emphasized that there is a treasure map...
