A.C. Rose orders Foyle to delegate his investigation of black marketing ring and personally look into the possibly seditious acts of a Socialist activist.
| Name | Type | Role | |
|---|---|---|---|
| Anthony Horowitz | Writer | ||
| Keith Thompson | Producer | ||
| Gavin Millar | Director | ||
| Toni Palmer | Actor | Brenda Wilson | |
| Michael Kitchen | Actor | Christopher Foyle | |
| David Alexander | Actor | Derek Woodgate | |
| Tony Turner | Actor | Warden | |
| Honeysuckle Weeks | Actor | Samantha Stewart | |
| Joanna Horton | Actor | Gwen Rivers | |
| Anthony Howell | Actor | Sergeant Paul Milner | |
| Lynda Rooke | Actor | Joanne Mason | |
| Peter Capaldi | Actor | Raymond Carter | |
| Charles Pemberton | Actor | Policeman | |
| David Westhead | Actor | Mark Talbot | |
| Peter-Hugo Daly | Actor | Kimble / William Mason | |
| Angela Curran | Actor | Nurse Jenny Wright | |
| Valerie Edmond | Actor | Lucinda Sheridan | |
| Corin Redgrave | Actor | Asst. Commissioner Rose | |
| Matthew Flynn | Actor | Peter Talbot | |
| Dugald Bruce-Lockhart | Actor | Captain Ralph Hammond | |
| Samuel Oatley | Actor | Jack Archer | |
| Elodie Kendall | Actor | Receptionist | |
| Geoffrey Freshwater | Actor | Sergeant Eric Rivers | |
| Helen Lindsay | Actor | Magistrate | |
| Fergus O'Donnell | Actor | Ernest Jones | |
| Eamon Geoghegan | Actor | Publican |