English nurse Edith Cavell (Anna Neagle) is matron in a small private hospital in German-occupied Brussels during WWI. When the son of a recently deceased patient (George Sanders) escapes from a German prisoner-of-war camp, Cavell aids him to reach Holland and safety. This leads to Cavell, a local noblewoman (Edna May Oliver), the grandmother of the escaped prisoner-of-war, and others to form an organization to help Belgian, French, English and other soldiers escape as well. Eventually the Germans become aware of what's happening and take action.
You can stream Nurse Edith Cavell (1939) free and legally on OldReel, via the Internet Archive.
Yes — it is in the public domain and can be watched and shared freely.