Sherlock Holmes gets the call when several young women turn up dead in London. The only common clue is that each corpse is missing a finger. Holmes suspects a diabolical plot hatched by his arch enemy Moriarty, but the trail leads him to a society of hypnotists, and a mysterious woman. Is she a temptress of pleasure or mistress of murder? Basil Rathbone and Nigel Bruce reprise their roles as Holmes and Dr. Watson, while Henry Daniell and Hillary Brooke are on hand as Moriarty and the alluring woman of the title!