A fabulous jewel known as the 'Dark Star' is stolen; a pastor's daughter gets involved, falling into the depths of a spy plot concerning war plans and fortifications...
| Actor | Role |
|---|---|
 Marion DaviesRue Carew | Rue Carew |
 Dorothy GreenPrincess Naia | Princess Naia |
 Norman KerryJim Neeland | Jim Neeland |
 Matt MoorePrince Alak | Prince Alak |
 Ward CraneFrench Secret Service Agent | French Secret Service Agent |
 George CooperMr. Brandes | Mr. Brandes |
| AArthur EarleMr. Stull | Mr. Stull |
 Gustav von SeyffertitzGerman Spy | German Spy |
| EEmil HochSteward | Steward |
| FFred HearnRev. William Carew | Rev. William Carew |
| JJames LaffeyShip Captain | Ship Captain |
| WWilliam BrotherhoodSteward | Steward |
| EEddie Sturgis'Parson' Smalley | 'Parson' Smalley |