The story concerns an attempt by fifth columnists to gain control of Australia's supplies of wolfram, a mineral used in the manufacture of munitions, involving a new wolfram field owned by Francis Jamieson (Marshall Crosby).
| Actor | Role |
|---|---|
| MMarshall CrosbyFrancis Jamieson | Francis Jamieson |
| JJohn FernsideMark Heinrich | Mark Heinrich |
| GGeorge LloydMonty Martin | Monty Martin |
| CCecil PerryArthur Rogers | Arthur Rogers |
| PPatricia McDonaldMarion Jamieson | Marion Jamieson |
 Raymond LongfordPeters | Peters |