Boyd struggles with his past while continuing the investigation on a mass murderer who was also guilty of killing his close friend. Are the Gunman's claims of innocence true? As the team investigate it looks as if someone else may have been involved.
| Name | Type | Role | |
|---|---|---|---|
| Ed Whitmore | Writer | ||
| Lara Cazalet | Guest Star | ||
| Claire Johnston | Guest Star | ||
| Raji James | Guest Star | ||
| Jonathan Phillips | Guest Star | ||
| Asad Ahmad | Guest Star | ||
| Kim Vithana | Guest Star | ||
| Guy Henry | Guest Star | ||
| Freddie Hale | Guest Star | ||
| Andrew Lewis | Guest Star | ||
| Clarke Peters | Guest Star | ||
| Ony Uhiara | Guest Star | ||
| Shirley Anne Field | Guest Star | ||
| Brendan Coyle | Guest Star | ||
| Sean Pertwee | Guest Star | ||
| Robert Pugh | Guest Star | ||
| Saskia Wickham | Guest Star | ||
| Joseph Tremain | Guest Star | ||
| Trevor Byfield | Guest Star | ||
| Cliff Parisi | Guest Star | ||
| Tim Mills | Guest Star | ||
| Russell Wilcox | Guest Star | ||
| Jason Hughes | Guest Star | ||
| Robert Bierman | Director |