A Norwegian scientist builds a device that can convert sound waves into electrical energy. However, the machine is stolen by the scientist's wife and assistant, who head across the frozen tundra towards Russia. A police inspector and a local girl team up with the scientist to help recover the device.
| Actor | Role |
|---|---|
 Jack WarnerInspector Peterson | Inspector Peterson |
 Nadia GrayKara Niemann | Kara Niemann |
 John McCallumDr. Nils Ahlen | Dr. Nils Ahlen |
 Anthony DawsonSven Nystrom | Sven Nystrom |
 Mary Laura WoodHelga Ahlen | Helga Ahlen |
 Naima WifstrandBaroness Erland | Baroness Erland |
 Norman MacOwanMcTavis, ferry pilot | McTavis, ferry pilot |
 Christopher LeeDet. Holt | Det. Holt |
 Alfred MaurstadTrerik | Trerik |
 Martin BoddeyChief of the Lost Valley | Chief of the Lost Valley |
 Ewen SolonDet. Anderson | Det. Anderson |
 Gösta CederlundProf. Lind | Prof. Lind |
 Sten LindgrenDirector-General of the Reasearch Institution | Director-General of the Reasearch Institution |
| PPeter BlitzAnders | Anders |
 Fritiof BillquistColonel Strand (uncredited) | Colonel Strand (uncredited) |
| SSarah CrawfordNoma (uncredited) | Noma (uncredited) |
| MMolly WarnerFrau Lind (uncredited) | Frau Lind (uncredited) |
| GGeorge WilloughbyBertil (uncredited) | Bertil (uncredited) |