In early-20th-century Arabia, Emir Nesib of Hobeika defeats Sultan Amar of Salma after years of war between their tribes and they make a peace treaty that creates “The Yellow Belt,” a large no-man’s-land that would separate their lands and would belong to neither of them. Further, Nesib demands that Amar’s sons, Saleh and Auda, be raise with his children, Tarik and Leyla, in Hobeika as a guarantee of their agreement. 15 years later, representatives of the Texas Oil find oil in the Yellow Belt and the modern and liberal Emir Nesib sees the opportunity to improve and modernize the life of his tribe, building hospitals and schools, and the American Company begins the exploitation of the oil field, violating the peace pact. Nasib sends a representative to make an agreement with the fundamentalist Sultan Amar, but he rejects the offer. Saleh decides to travel to Salma to talk to his father and kills his two companions, but he is captured and murdered by Tarik. Prince Auda and Princess Leyla, who have been in love with each other since childhood, get married with the full permission of Nesib. Auda travels to Salma expecting to convince his father to associate to Nesib, but the conservative Amar rejects the proposal and decides to fight against Nesib. Now, Prince Auda shall decide on which side he will fight.