Missing (1982)

Based on the real-life experiences of Ed Horman, this is the story of an American father of conservative background who comes to a South American country to search for his missing son, a journalist. Ed joins with his daughter-in-law Beth, who like her husband is politically polarized from the father, in prying through the bureaucracy and dangerous political intrigue in search of their son and husband. Little by little, the father comes to realize that his own beloved government is not telling him the truth.