A professor who found out a formula to make diamonds from oil is killed in Tehran and his nephew who is a spy is sent to Tehran by Interpol in order to find the formula.

• Plaza Studio
• Nancy Kovack
• Taghi Zohuri
• Marina Mater
• Zackaria Hashemi
• Nersi Korkia
• Katayun Amir Ebrahimi
• Hamide Kheyrabadi
• Dariush Talayi