“Missing” (1982) is one of the best of director Costa-Gavras’s long filmography of great political dramas. It’s based on the true investigation of the disappearance of American filmmaker and journalist Charles Horman during the 1973 Pinochet coup in Chile. Jack Lemmon and Sissy Spacek both contribute outstanding performances as Charles’s father and wife, who are led by officials through a darkly revelatory bureaucratic maze on their quest to find the truth about Charles’s fate.