The Hand of Fu Manchu

The Hand of Fu Manchu is the third of the Fu Manchu books. In the second book Fu-Manchu disappears. The third book finds Nayland Smith and his friend and assistant Dr. Petrie called back to London with a new threat to England and even the world. The threat is a secret cult / organization from Asia the Si-Fan which uses occult practices and strange mysterious people to try to take out Smith and Petrie. It turns out that Fu-Manchu was one of the senior members of Si-Fan.