An aristocratic widow discovers that her former lover, a medical officer in the British army, is secretly a German spy.
| Actor | Role |
|---|---|
| MMara Russell-TavernanLady Irma Enderby | Lady Irma Enderby |
| IIvan CraigMaj. Seton | Maj. Seton |
 Valentine DyallIntelligence Director | Intelligence Director |
 Derek AylwardVictor | Victor |
| JJulian SherrierTony | Tony |
| LLee FoxMaj. Malcolm | Maj. Malcolm |
| HHamilton KeeneCol. Lorimer | Col. Lorimer |
| EEddie LeslieCapt. Blynne | Capt. Blynne |
 Desmond LlewelynPoliceman | Policeman |