A falsely convicted man's wife, Catherine, and an alcoholic composer and pianist, Martin, team up in an attempt to clear her husband of the murder of a blonde singer, who is Martin's wife.

A convicted thief in Dartmoor prison hides the location of the stolen Bank of England printing plates inside three music boxes. When the innocent purchasers of the boxes start to be murdered, Holmes and Watson investigate.

In World War II, a British secret agent carrying a vitally important document is kidnapped en route to Washington. The British government calls on Sherlock Holmes to recover it.

Holmes and Watson board a passenger train bound from London to Edinburgh, to guard the Star of Rhodesia, an enormous diamond worth a fortune belonging to an elderly woman of wealth; but within the first hour of the trip, the woman's son is murdered and the diamond stolen and any of the passengers in their car could be the killer thief.

With an involved, detailed mystery and an elegant adversary played by Gale Sondergaard, this is one of the most entertaining features in the Sherlock Holmes series of movies starring Basil Rathbone and Nigel Bruce. The story gets a little far-fetched, but it is quite interesting. It is loaded with plot devices pulled from several different Arthur Conan Doyle stories, and it's interesting to see how many you can catch. It also features the usual pleasant camaraderie between Rathbone and Bruce, plus Dennis Hoey as Inspector Lestrade.

As "The Spider Woman", Sondergaard creates a memorable opponent for Holmes. The slightly exaggerated role cannot have been much of a challenge for such a fine actress, but she puts her heart into it, and looks as if she is enjoying herself - as her character certainly is. By creating such a dynamic character, she also helps make the complicated story seem more plausible, and it creates a worthy challenge for Holmes.

The movie also contains the amusing bits of dialogue and detail that characterized so many of the movies in the series. The climactic sequence, in particular, is a very good combination of suspense and wit. It is a fitting way to cap off an enjoyable entry in the popular series.

During WWII several murders occur at a convalescent home where Dr. Watson has volunteered his services. He summons Holmes for help and the master detective proceeds to solve the crime from a long list of suspects including the owners of the home, the staff and the patients recovering there.

Sherlock Holmes investigates when young women around London turn up murdered, each with a finger severed. Scotland Yard suspects a madman, but Holmes believes the killings to be part of a diabolical plot.