A criminologist and a government agent team up to expose a ring of German spies.
| Actor | Role |
|---|---|
 King BaggotHarrison Grant | Harrison Grant |
 Marguerite SnowDixie Mason | Dixie Mason |
 William BaileyHeinrich von Lertz | Heinrich von Lertz |
 Bertram MarburghCount Johann von Bernstorff | Count Johann von Bernstorff |
 Paul EvertonCaptain Franz von Papen | Captain Franz von Papen |
 Wellington A. PlayterFranz von Rintelen | Franz von Rintelen |
| FFlorence ShortMadame Augusta Stephan | Madame Augusta Stephan |
| JJohn P. WadeCaptain Karl Boy-Ed | Captain Karl Boy-Ed |
| FFred C. JonesFred C. Jones | Fred C. Jones |
| LLouise HotalingNot listed | Not listed |