Based on the Sir Authur Conan Doyle story "The Dancing Men", Sherlock Holmes and Dr. Watson are placed in WWII europe to help protect a scientist and his invention from the Nazis. Basil Rathbone .... Sherlock Holmes Nigel Bruce .... Dr. John H. Watson Lionel Atwill .... Professor Moriarty Kaaren Verne .... Charlotte Eberli William Post Jr. .... Dr. Franz Tobel Dennis Hoey .... Inspector Lestrade Holmes Herbert .... Sir Reginald Bailey Mary Gordon .... Mrs. Hudson