Holmes (Basil Rathbone) variously disguises himself as an old Swiss bookseller, a villainous waterfront lascar, and a bearded scientist in an attempt to keep his archenemy Prof. Moriarty (Lionel Atwill) from the newly developed bombsight the English hope to use on Hitler. Moriarty pops up
just when everyone thought him to be long dead. He's working for the Nazis in this one. In one confrontation between Holmes and his nemesis, the former is strapped to a table and tortured by having his blood taken from his veins, drop by drop. This was the first of 11 in the Holmes series to be
directed by Roy William Neill who kept everything at a swift pace, including the dialog...