A non-stop Sax Rohmer yarn. A slipper believed to belong to the prophet Mohammed has been stolen by a British archaeologist and a Muslim sect are after all who come into contact with it, the leader of the sect Hassan of Aleppo, is very much a stand in for Rohmer most famous creation Fu Manchu. The complexity of the schemes to recover and steal the slipper are complicated even more by an American gangster, who is also after it, for his own ends.