In this last episode, Samira Ahmed travels to the crumbling ruins of an ancient walled city and goes back to when Persia faced her gravest threat: Genghis Khan.But from the death and destruction, emerged a golden age of Persian poetry and art. In the fabled city of Isfahan, Samira encounters the dynasty of Shahs that succeeded the Mongols - The Safavids, who gave Iran a powerful new identity through Shia Islam and carved its message in stone, brick and tile.Finally Samira travels to Persepolis, to tell the story of Iran's last Shah and his ill-fated attempt to link his dynasty to Persia's ancient kings, with momentous consequences for the world.