Boundaries: Angélica, a Spanish expatriate living in San Diego, visits Tijuana for the first time and discovers the American Immigration Service will not let her return home to San Diego. She is further frustrated because the American Consulate is inexplicably unavailable to help her. While waiting for the consulate, she encounters an itinerate musician, a mute trombonist, who gets her attention by tapping her on the head with his trombone slide...