Diamond thieves have infiltrated the staff of O'Day Jewelry. The Los Angeles Police Dept. employs their newest weapon, an airplane, to help smash the diamond theft ring.
| Actor | Role |
|---|---|
 Neil HamiltonJack MacDowell | Jack MacDowell |
 Dorothy GulliverGwen O'Day | Gwen O'Day |
 Ralph LewisDan MacDowell | Dan MacDowell |
 Nigel BarrieRobert Chandler | Robert Chandler |
 Claire McDowellMrs. MacDowell | Mrs. MacDowell |
 Fred EsmeltonHoward aka Matthew O'Day | Howard aka Matthew O'Day |
 Harry NorthrupA.E. Blair | A.E. Blair |
 Thelma ToddRose aka Flora Fisher | Rose aka Flora Fisher |
| DDavid KirbyRed | Red |
 Joseph W. GirardChief of Police Davison | Chief of Police Davison |
 William BakewellJerry MacDowell | Jerry MacDowell |