An intruder is shot dead at a Territorial Army base. Clark is forced to accept help from Angela Berridge, an official from the Home Office, and finds that the activities of MI5 and Special Branch undermine his investigation.
| Name | Type | Role | |
|---|---|---|---|
| Rob Heyland | Writer | ||
| David Savile | Guest Star | ||
| Michael Pennington | Guest Star | ||
| Michael Byrne | Guest Star | ||
| Gillian McCutcheon | Guest Star | ||
| Keith Bartlett | Guest Star | ||
| Richard Graydon | Guest Star | ||
| Sharon D. Clarke | Guest Star | ||
| Peter Theedom | Guest Star | ||
| Duncan Bell | Guest Star | ||
| Vincent Brimble | Guest Star | ||
| Richard Clifford | Guest Star | ||
| James Bowers | Guest Star | ||
| John Strickland | Guest Star | ||
| Stephen Marcus | Guest Star | ||
| Michael Keating | Guest Star | ||
| Alex Hardy | Guest Star | ||
| Michael Healy | Guest Star | ||
| Roy Battersby | Director |