A Transylvanian nobleman called Count Dracula arrives at Baker Street seeking the help of Sherlock Holmes, for his beloved wife Mina has been kidnapped. But Dracula is a client like no other and Sherlock and Watson must confront despite the wild, unbelievable notion the existence of vampires. And before long, Sherlock, Watson and their new vampire allies must soon work together to banish a powerful enemy growing in the shadows.