In "The Capital of the World," Ernest Hemmingway described the story of a father who was anxiously searching for his son who had run away from home. After searching everywhere, he decided to go to the city where his son lived, hoping to find him. However, he encountered many difficulties, including language barriers and cultural differences. In the end, through his own efforts and communication with the local people, he finally discovered the existence of his son and spent a good time with him. The story emphasized the importance of family and the deep emotional bond between father and son.