THE UNDOCUMENTED tells the story of Marcos Hernandez, an undocumented Mexican living and working in Chicago. Marcos came to the United States by crossing through the Sonora Desert in southern Arizona. Each month he sends money to his mother in Mexico City for medicine for his brother Gustavo, who is in need of a kidney transplant. But Marcos had an even more pressing reason for coming to the United States. He came to search for his father, Francisco, who disappeared in the desert trying to enter the United States. Chronicled over the course of Arizona’s deadly summer months, the film weaves Marcos’s search for his father with the efforts of humanitarians and border patrol agents who try to prevent migrant deaths.