Detective Sherlock Holmes (Basil Rathbone) and his trusty partner Dr. Watson (Nigel Bruce) travel to Quebec, Canada, where a gentlewoman is found dead with her throat torn out.
The film is based on a novel written by Johnston McCulley. It is about a young aristocrat who attempts to hide who he is because he wants to restore justice to California. What challenges must he face to keep secret?
The Mark of Zorro