![Mary Gordon](http://image.tmdb.org/t/p/w92/u4QD0zsgBgXTi3At0e0ow8VdiEi.jpg)
Sherlock Holmes investigates a series of so-called "pajama suicides". He knows the female villain behind them is as cunning as Moriarty and as venomous as a spider. Based on "The Sign of Four" and the short stories "The Dying Detective", "The Final Problem", "The Speckled Band" and "The Adventure of the Devil's Foot".