In this sequel to The Insidious Dr. Fu-Manchu, the mysterious and malevolent Doctor returns to carry out his fiendish plan and further the cause of his secret political order from the Mandarin province of Ho-Nan. Fu-Manchu summons a poisonous cat, fiery hands of death and a mummy to hunt down the Reverend Eltham and obtain the coveted name of a secret agent in China. Neyland Smith and Dr. Petrie are subjected to the tortures of the Wire Jacket and the Six Gates of Joyful Wisdom as they attempt to thwart the evil Doctor and they narrowly escape death on the moors of West England. Has the beautiful Karamaneh returned to aid the nefarious Chinaman, or Smith and Petrie? Can the relentless, cruel master of the Yellow Peril be stopped this time?