The renowned Prince Arsalan

1934. A barber is suffering from high prices and his difficult situation. He has eleven children, and his pregnant wife gives birth to twins. The man, who believes in the bad luck of the number thirteen, leaves one of the twins in the car of a young couple, unaware that his thirteenth child has remained with him. The young couple adopts the baby and takes it to Abadan.

The sultan finally has a son after a long wait, but when he is about to introduce his heir, he is murdered by his vizier's conspiracy.

The boy is a medical student, and the girl is a law student. They meet, fall in love, and decide to get married. However, the girl is forced to marry a wealthy man. Years later, the girl's husband is injured in an accident and taken to the hospital where the boy is a doctor. Here, the two old lovers meet again. Later, the girl's husband is murdered, and the boy is accused of murder because of his relationship with the girl and is prosecuted. But it soon becomes clear that the girl's husband had a mistress, and the mistress is the killer.