Told through four interlinked cases, this Gothic horror mystery sees Sherlock Holmes and Count Dracula join forces to banish a terrible enemy.1902. Sherlock Holmes’s latest case begins with a severed finger. With no signs of decomposition and an adverse reaction to silver, it is the most perplexing mystery yet — one that relates to their next client — and the moment Sherlock’s and Watson’s lives are irrevocably changed.A Transylvanian nobleman called Count Dracula arrives at Baker Street seeking Sherlock’s help, 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 work together to banish a powerful enemy growing in the shadows…