Bat Wing

'Bat-Wing' is a mystery novel written by Sax Rohmer, was an English novelist who is best remembered for his series of novels featuring the master criminal Dr. Fu Manchu. However, in this particular work, Dr. Fu Manchu is nowhere to be seen; the lead character is instead a private investigator named Paul Harvey. The PI finds himself in the midst of several crime scenes featuring an odd clue—a silhouette of a bat.