http://imdb.com/title/tt0043041/ The true story of Agnes Newton Keith's imprisonment in several Japanese prisoner-of-war camps from 1941 to the end of WWII, with the man you love to hate - Sessue Hayakawa. Few recall that, before Valentino and Romero, Sessue was Holloywood's first exotic foreign romantic lead
You can stream Three Came Home (1950) free and legally on OldReel, via the Internet Archive.
Yes — it is in the public domain and can be watched and shared freely.