Paul Harley is sitting in his office chatting with his friend, Knox. Harvey is a private detective, but also a consultant to the politics of the British Empire. The two are chatting about what job Paul should take next when Colonel Juan Menendez walks through the office doors. He believes that someone is after him, something that Paul believes is simply paranoia. But Menendez is convinced that there is someone watching him even though all he's ever seen is a shadow of the person. Then Menendez produces the wing of a bat, something that was left for him. And suddenly, Harley is plunged into a world of voodoo, vampires and murder

Sax Rohmer was a prolific author of early science fiction and fantasy. He was perhaps best known for creating the super-villian, Dr. Fu Manchu -- a character who went on the become the subject of many films and, in fact, much plundering. (Think about it for a moment: how many evil Chinese Mandarin masterminds have you heard tell of? Remember Ian Fleming's Dr. No? Remember Lo-Pan, from Big Trouble in Little China? Egg Fu, from Wonder Woman? Be careful. They're everywhere.)