Classic public domain film, digitally preserved and free to stream forever.
British Intelligence (1940) is a WWI spy thriller in which a German spy infiltrates British high command by posing as a wounded officer given shelter in the home of a senior government official — while a mysterious woman in the same household may or may not be a double agent working against Germany.
Starring Boris Karloff, Margaret Lindsay, and Maris Wrixon. This film is in the public domain and free to watch, download, and share.