Foyle is drawn into the bizarre murder of an ex-Nazi defector and leading expert on Soviet intelligence who had been working for MI5.
| Name | Type | Role | |
|---|---|---|---|
| Anthony Horowitz | Writer | ||
| Stuart Orme | Director | ||
| Andrew Bennett | Actor | Dr. Trevelyan | |
| Alex Clatworthy | Actor | Charlotte | |
| Honeysuckle Weeks | Actor | Sam Wainwright | |
| Fiona Button | Actor | Mary Nelson | |
| Tim McMullan | Actor | Arthur Valentine | |
| Daniel Weyman | Actor | Adam Wainwright | |
| Karl Shiels | Actor | American Major | |
| Colin Stinton | Actor | Lt. Colonel Hoyt Jackson | |
| Jimmy MacDermott | Actor | Dr. Phillips | |
| David Ryan | Actor | Mr. Cranston | |
| Emma Colohan | Actor | Miss Watkins | |
| Mary Sheen | Actor | Mrs. Jones | |
| Michael Kitchen | Actor | Christopher Foyle | |
| William Armstrong | Actor | Ray Donovan | |
| Tamzin Outhwaite | Actor | Brenda Stevens | |
| Lars Eidinger | Actor | Karl Strasser | |
| Paul Benzing | Actor | George Gibson | |
| Robert Donnelly | Actor | Simmonds | |
| Jeremy Swift | Actor | Glenvil Harris | |
| Rupert Vansittart | Actor | Sir Alec Myerson | |
| Ellie Haddington | Actor | Hilda Pearce | |
| David Hounslow | Actor | Parry-Jones | |
| Jodie Hay | Actor | Student | |
| Mark Huberman | Actor | MI5 Guard | |
| Daniel Hill | Actor | Headmaster | |
| Andrew Tiernan | Actor | Geoffrey Helliwell | |
| Radeck Belchnerowski | Actor | Tchorek | |
| Richard Dillane | Actor | Charles Roper | |
| Charles Aitken | Actor | Thomas Nelson |