There are further twists ahead for Nikki, Jack and the team as they work with the police to explore multiple avenues to solve a 20-year-old case.
| Name | Type | Role | |
|---|---|---|---|
| Ed Whitmore | Writer | ||
| Neil Hobbs | Guest Star | Mike Jarvis | |
| Sally Rogers | Guest Star | Mary Streeting | |
| Hermione Norris | Guest Star | CS Sheila Court | |
| Steve Nicolson | Guest Star | Keith Pryor | |
| Anne Lacey | Guest Star | Gillian Kerr | |
| Jude Akuwudike | Guest Star | Malcolm Jones | |
| Melanie Kilburn | Guest Star | DI Mel Granger | |
| Neil Pearson | Guest Star | DI Steve Tudor | |
| Ellen Thomas | Guest Star | Esther Daniels | |
| Rupert Holliday Evans | Guest Star | Russell Drake | |
| Hayley Carmichael | Guest Star | Joanne Perry | |
| Monika Miles | Guest Star | Anna Górska | |
| George Watkins | Guest Star | Carl Streeting | |
| Sharon Rose | Guest Star | DC Chloe Abbott | |
| Toby Frow | Director |