After the legendary introduction in "A Study in Scarlet," Sir Arthur Conan Doyle crafted his most action-packed Sherlock Holmes adventure—one that has captivated filmmakers from classic Hollywood to modern British television adaptations. "The Sign of Four" delivers everything movie audiences love: exotic treasures, deadly pursuits, mysterious pacts, and a romance that would change Dr. Watson's life forever.

Experience the complete second Holmes novel through our immersive audiobook, where every twist and turn that inspired countless screen adaptations unfolds in Doyle's masterful prose. This is the case that introduced Mrs. Hudson, showcased Holmes' famous cocaine habit, and featured the detective's most dangerous chase through the fog-shrouded Thames—scenes that filmmakers have recreated again and again.

The Hollywood versions capture the adventure, but only the original text reveals the full complexity of the Agra treasure mystery spanning British India, a fortress siege, and a decades-old pact between four desperate men. Discover the complete backstory of Jonathan Small and his wooden-legged pursuit of justice that most adaptations had to compress or eliminate entirely.

Witness Mary Morstan's first appearance—the woman who would become Watson's wife, a relationship that modern adaptations like BBC's "Sherlock" have reimagined but never quite matched for romantic depth. Experience Toby the bloodhound's crucial tracking scene and the exotic atmosphere of Victorian London's docklands that inspired countless film noir sequences.

Whether you've enjoyed the Granada Television series with Jeremy Brett, the modern BBC adaptations, or Hollywood's action-packed interpretations, this audiobook offers the authentic source material with all its Victorian atmosphere, intricate plotting, and psychological depth intact.

Listen now to the adventure that proved Holmes wasn't just a brilliant detective, but an action hero—and discover why this particular case has remained filmmakers' favorite Holmes story to adapt for over a century.