No perigoso distrito de Limehouse, na Londres vitoriana, uma série de crimes macabros leva os jornais a espalhar a notícia de que são obra de uma criatura demoníaca do folclore local, um Golem. Sem pistas concretas, a polícia atribui o caso ao Inspector Kildare. Ele, porém, foi ali colocado para servir de “bode expiatório”, para a eventualidade de não conseguirem apanhar o culpado.

Lieutenant Commander John Byrne of the Naval Secret Service and his partner Pvt. Bill Riggers chase criminal Dr. Sin Fang, who is desperate to find a lost sacred seal. (The fifth and only surviving episode of a six-part serial about an evil mastermind inspired on Sax Rohmer's Dr. Fu Manchu.)

From the Universal synopsis: Retired Inspector Blake of Scotland Yard learns that Lord Blanton has acquired the sacred "Love Ring"---a cursed jewel that has brought grief to its previous owners. Prince Darius seeks to obtain the ring, and the mummy of a princess of an ancient country to return them to his homeland.