The police grow frustrated with the lack of a forensic link, but Sam finds more clues in an old case.
| Name | Type | Role | |
|---|---|---|---|
| Ashley Pharoah | Writer | ||
| Nigel McCrery | Writer | ||
| Timothy Block | Guest Star | First Prison Officer | |
| Ian Keith | Guest Star | P.C. Jarvis | |
| Roger Ringrose | Guest Star | Police Officer | |
| David Sumner | Guest Star | Simon Clarke | |
| Emily Mortimer | Guest Star | Fran | |
| James Hornsby | Guest Star | Second Prison Officer | |
| James Bree | Guest Star | Brewer | |
| Dione Inman | Guest Star | Prison Nurse | |
| Philip Aldridge | Guest Star | Police Officer | |
| Tim McEvoy | Guest Star | S.O.C.O. | |
| Maryann Turner | Guest Star | Jean | |
| Diana Berriman | Guest Star | Midwife | |
| Philip Anthony | Guest Star | Vicar | |
| Kemal Sylvester | Guest Star | Teddy | |
| Rebecca Craig | Guest Star | Jenny Stewart | |
| Rebecca Reilly | Guest Star | Young Louise | |
| Rob Dixon | Guest Star | Charlie | |
| Sean Gallagher | Guest Star | Daniel Finn | |
| James Wilson | Guest Star | Alvin | |
| Colin Salmon | Guest Star | Sebastianne Bird | |
| Frances Carder | Guest Star | Janet Owen | |
| Juliette Gruber | Guest Star | Louise Owen | |
| Ronald Pickup | Guest Star | Dr. Richard Owen | |
| Mike Barker | Director |