That’s right, Nazis. Holmes and Watson (Nigel Bruce) are transported about fifty years to the (then) present day to do their part in the war effort. This is possible because “the immortal character of fiction created by Sir Arthur Conan Doyle, is ageless, invincible and unchanging”, so, yea. That. Not sure how a modern day Sherlock played to audiences back then, but since it’s been seventy five years since the movie came out, it still plays somewhat as a period piece.
Anachronisms aside, The Voice of Terror is a better than fair mystery (there's a spy) with all the wit and charm of the earlier films. Given my druthers, I’d prefer it set in Victorian London, but while America escaped the war to the cinemas, England had no such option. We had difficulty getting meat and gasoline, they were eating acorns. Universal did a good job picking up the franchise. AMRU 3.5.
“There's an east wind coming all the same, such a wind as never blew on England yet. It will be cold and bitter, Watson. And a good many of us may wither before its blast. But it's God's own wind nonetheless and a greener, better, stronger land that will lie in the sunshine when the storm is cleared.”