When nuclear scientists are kidnapped and smuggled behind the Iron Curtain, an FBI man and a British agent are assigned to catch the kidnappers.
| Actor | Role |
|---|---|
 George RaftSteve Rossi | Steve Rossi |
 Sally GrayJoan Miller | Joan Miller |
 Clifford EvansMichael Grand | Michael Grand |
 Reginald TateColonel Wilkes | Colonel Wilkes |
 Patricia LaffanIrma Brookes | Irma Brookes |
 Frederick PiperInspector Reid | Inspector Reid |
| RRoddy HughesPorter | Porter |
 June AshleyBlonde Contact in Flat | Blonde Contact in Flat |
 Grace ArnoldNeighbour (uncredited) | Neighbour (uncredited) |
| EErnest BlythMorgue Attendant (uncredited) | Morgue Attendant (uncredited) |
 Cyril ChamberlainBailey (uncredited) | Bailey (uncredited) |
 Arnold DiamondMax (uncredited) | Max (uncredited) |
 Howard DouglasTaxi Driver (uncredited) | Taxi Driver (uncredited) |
| AArthur LovegrovePhillips (uncredited) | Phillips (uncredited) |
| AAnthony PendrellRees (uncredited) | Rees (uncredited) |
| NNorman PierceInspector Hobbs (uncredited) | Inspector Hobbs (uncredited) |
 Harry TowbImmigration Officer (uncredited) | Immigration Officer (uncredited) |
| JJohn WarwickSecurity Chief Brice (uncredited) | Security Chief Brice (uncredited) |