A German spy is dispatched to Britain to search out targets for a planned invasion.
| Actor | Role |
|---|---|
 Edmund GwennTom Brown | Tom Brown |
 Mary MaguireBetty Brown | Betty Brown |
 Paul HenreidVictor Brandt | Victor Brandt |
 Geoffrey ToonePeter Templeton | Peter Templeton |
 Richard AinleyGeoffrey Brown | Geoffrey Brown |
 Desmond TesterBilly Brown | Billy Brown |
 Carl JaffeMartin | Martin |
| MMeinhart MaurWaldo | Waldo |
 Mavis VilliersDolly | Dolly |
| MMark LesterUncle Ben | Uncle Ben |
 Norah HowardMaggie | Maggie |