In the lobby of Shepherds Hotel in Cairo Sean Grevile recognizes Fa Lo Swee, daughter of Dr.Fu Man Chu. he follows her in to the native city where he is trapped by agents of Dr. Fu and taken to the Manchu house. Under the influence of a mysterious drug prepared by the doctor Grevile sees in Fu Manchu an all powerful superman to be respected and obeyed. While under the influence of the drug he lures Rima Barton in to his car and drives off with her towards the headquarters of Dr. Fu Manchu...