A French sleuth in England helps the police solve a series of murders linked by the diary pages of a dead woman.
| Actor | Role |
|---|---|
 Austin TrevorPierre Santos | Pierre Santos |
 George HayesHenry Otisse | Henry Otisse |
 Garry MarshGeoffrey Luce | Geoffrey Luce |
| BBrian BuchelAdam Steele | Adam Steele |
 Robert HortonSir George Frame | Sir George Frame |
 Frederick BurtwellDet. Inspector Grant | Det. Inspector Grant |
| KKiyoshi TakaseManservant | Manservant |
| CClaude HortonDyson | Dyson |
 Dorothy BoydDorothy Ayres | Dorothy Ayres |
| MMarjorie ChardLady Groombridge | Lady Groombridge |
| VVera BogettiAgnes Judd | Agnes Judd |
 Dorothy MintoLilian Hope | Lilian Hope |
 Kathleen HarrisonNurse | Nurse |
 Aubrey MallalieuDoctor | Doctor |