Missing (1982) / Savnet (UK-import)
Based on a true story, this is a political drama set during a military coup in South America. American political activist Charles Horman (John Shea) suddenly disappears. His wife Beth (Sissy Spacek) and his father Ed Horman (Jack Lemmon) go in search of their husband and son, but Ed soon realises that the family has been betrayed by their own government.