Sax Rohmer 
The Yellow Claw [EPUB ebook] 

The elusive Oriental villain known as Mr. King masterminds an insidious plot to hold London’s wealthy at his mercy. His henchmen have already killed one socialite, and more are threatened. Hot on the trail are two of Sax Rohmer’s greatest detectives, Gaston Max and Inspector Dunbar, as they undertake a case that threatens to destroy the cream of British society…