'Crooks steal pearls and helicopter plans.' (British Film Catalogue)
| Actor | Role |
|---|---|
 Wallace BoscoEdward Hamilton | Edward Hamilton |
| DDoris ClemenceMrs. Wickham | Mrs. Wickham |
 Eve GrayJoan Hamilton | Joan Hamilton |
| SSam LiveseyInspector Cobb | Inspector Cobb |
 John LongdenHarry Crawford | Harry Crawford |
 Lester MatthewsCharles Wickham | Charles Wickham |
| WWalter PiersGeorge Beverley | George Beverley |
 John TurnbullHoward Clayton | Howard Clayton |