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.)

Cast:H. Agar Lyons, Fred Paul, Wally Patch, Fred Rains, Evelyn Arden,

Genre:Crime, Adventure, Drama,

country:United Kingdom,

Production:P. E. P., BFI,