Sherlock Holmes in Washington - 1943

Sherlock Holmes in Washington (1943) is the fifth film in the Basil Rathbone/Nigel Bruce series of Sherlock Holmes movies. The plot is an original story not based on any of Sir Arthur Conan Doyle's Holmes tales.
Alfred Pettibone, a British secret agent carrying a vital secret document, is murdered on his way to deliver it in the U.S. The British government turns to Sherlock Holmes for help. He deduces that Pettibone converted the document to microfilm. Avoiding an assassination attempt, he hurries to Washington, D.C., with Dr. Watson to retrieve it before it falls into the hands of an "international spy ring".