From the series, ‘The Further Adventures of Sherlock Holmes’, a collection of books written by different authors all creating new Sherlock Holmes stories. 

This one was a bit more fanciful than Sherlock normally gets.  Apparently, it’s no big deal when Watson and Holmes are faced with vampires, as Holmes’ cousin just happens to be Prince Dracula (a surprisingly nice version of Dracula who will help them in their investigation).  They are called in to investigate the death/kidnapping of a young woman and vampire chaos ensues – a centuries old vampire is after revenge, Holmes gets kidnapped, and they all travel to Russia to save a second kidnapped woman.