Det. Supt. Clark investigates the involvement of Special Branch in the 'execution' of police informant Declan Harris, and gets the chance to settle old scores with Det. Chief Supt. John Deakin.
| Name | Type | Role | |
|---|---|---|---|
| J. C. Wilsher | Writer | ||
| Tam Dean Burn | Guest Star | ||
| Matyelok Gibbs | Guest Star | ||
| Nick Dunning | Guest Star | ||
| Gavin Richards | Guest Star | ||
| Christine Kavanagh | Guest Star | ||
| Robin Ellis | Guest Star | ||
| Adie Allen | Guest Star | ||
| Nina Marc | Guest Star | ||
| Lizzy McInnery | Guest Star | ||
| Frank Harper | Guest Star | ||
| David Morrissey | Guest Star | ||
| Lalor Roddy | Guest Star | ||
| Richard Standeven | Director |