Just a quick note for fans who enjoy reading outside the Canon. Fred Saberhagen’s The Holmes-Dracula File deals with a meeting between Dracula and Holmes, which delves into the case of the Giant Sumatran Rat, and also reveals some surprising information about Holmes’ family history!
(This is one volume of Saberhagen’s excellent series on Dracula, beginning with The Dracula Tapes, which covers the events of the original Bram Stoker book, but from the Count’s viewpoint.)