Sax Rohmer 
Devil Doctor 

This is the second volume in Sax Rohmer’s Fu Manchu series, and the first full novel; it may also be found alternatively titled as "The Return of Dr. Fu Manchu." (The first volume, if you wish to start at the beginning, is a collection of short stories, and can be found either titled "The Mystery of Dr. Fu Manchu" or "The Insidious Dr. Fu Manchu"). "The Devil Doctor" was written 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)