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.)
| Directing | Fred Paul | Director |
| Writing | Patrick K. Heale | Screenplay |
| Camera | Frank Canham | Director of Photography |
| Production | Fred Paul | Producer |
