After three entries in which Sherlock Holmes (Basil Rathbone) investigated Nazi plots, Universal studios altered its approach with a series of films which stayed in the present day, but shifted closer to the spirit of Arthur Conan Doyle's stories. And this proved successful. This one takes its outline from The Musgrave Ritual.
Dr. Watson (Nigel Bruce) is working in an isolated old dark house which has been taken over by the military to treat officers suffering from PTSD in WWII. Only someone is murdering the aristocratic family which owns the estate. Could it be related to the cryptic rhyme that has been passed down for generations?
And does the code lead to a hidden fortune? Roy William Neill directed the last nine films in the series, and he gives them an atmosphere of Universal Horror, with the thunderstorms, the fog, the ancient crypt and the folklore. The many changes to the original story are not necessarily improvements, but still effective.
Anyone who has seen this will remember the human game of chess, which is unique to the film. There's a lot of comedy; the way Watson and Inspector Lestrade (Dennis Hoey) as a pair of buffoons are instinctively competitive, is always funny. And thankfully, Rathbone is rid of the weird Roman haircut he wore to fight the Nazis.