Sax Rohmer 
Fire-Tongue 

A new force stalks the fog-shrouded streets of London, bringing death to its victims … the mysterious Fire-Tongue! Psychic detective Paul Harley investigates, in this mystery classic with supernatural elements. From the author of the Fu Manchu books. "Fire Tongue" is a supernatural novel by Arthur Henry Sarsfield Ward, known better under his pseudonym, Sax Rohmer. Sax Rohmer was a prolific eng novelist. He is best remembered for his series of novels featuring the master criminal Dr. Fu Manchu. (Excerpt from Wikipedia)