Foyle's investigation into the death of a nameless Russian leads to a mysterious military facility and the discovery that the victim was a spy with dangerous connections to British intelligence.
| Name | Type | Role | |
|---|---|---|---|
| Anthony Horowitz | Writer | ||
| David Kane | Writer | ||
| David Richards | Director | ||
| Laura Way | Actor | Evelyn Green (older) | |
| Lucy-Anne Holmes | Actor | Evelyn Green (younger) | |
| Catherine Kanter | Actor | Katrin | |
| Rupert Vansittart | Actor | Sir Alec Meyerson | |
| Stephen Swift | Actor | Soldier at Barton Hall | |
| Honeysuckle Weeks | Actor | Sam Wainwright | |
| Simon Coury | Actor | George Greene | |
| Michael Kitchen | Actor | Christopher Foyle | |
| Thomas Padden | Actor | D.S. Jones | |
| Alex Clatworthy | Actor | Charlotte | |
| Tom Beard | Actor | Captain McDonald | |
| Daniel Weyman | Actor | Adam Wainwright | |
| Norma Sheahan | Actor | Nurse | |
| Anne O'Neill | Actor | Lady at tea | |
| Ellie Haddington | Actor | Hilda Pearce | |
| Jonathan Hyde | Actor | Colonel Galt | |
| Jeremy Swift | Actor | Glenvil Harris | |
| Radoslaw Kaim | Actor | Grigory Palenko | |
| Karl Shiels | Actor | Man with photographer | |
| Tim McMullan | Actor | Arthur Valentine | |
| Gerard Jordan | Actor | Soldier in Barton Hall Basement | |
| Ruth McCabe | Actor | Mrs. Green | |
| Rufus Wright | Actor | Dr. Ian Ross | |
| Donal Gallery | Actor | Gate Guard at Barton Hall | |
| Ross Armstrong | Actor | Danny Wills |