Four Men and a Prayer (1938) on Netflix

Plot summary

Loring Leigh has been stripped of his rank in India over a charge of dereliction of duty, and he summons his four sons to the family home to tell them he was set up. He is killed before he can say who framed him. Geoffrey, Wyatt, Christopher and Rodney, with almost nothing to work from, split the search between them, two bound for India and two for South America, hoping to bring back proof of their father's innocence. In Buenos Aires, Geoffrey and Christopher witness a massacre of townspeople who had taken up arms against the government, and meet Lynn Cherrington, Geoffrey's girlfriend, whose path keeps crossing theirs.