A five-year-old girl goes missing and the police are called in to search. When her body is found inside a sewage pipe, it becomes a murder investigation, which is headed by Detective Superintendent Walker. They follow a few leads and eventually arrest a suspect, who is then sent to trial.
| Name | Type | Role | |
|---|---|---|---|
| Lynda La Plante | Writer | ||
| Rhys Ifans | Guest Star | Michael Dunn | |
| Corin Redgrave | Guest Star | Rylands | |
| Aisling Walsh | Director | ||
| Lynda La Plante | Director | ||
| Anastasia Hille | Actor | Belinda Sinclair | |
| Vera Jakob | Actor | Ivy Green | |
| Daniel Ryan | Actor | P.C. Brown | |
| Sam Loggin | Actor | Madeleine Gillingham | |
| Hugh Dickson | Actor | Usher | |
| Gerry Cowper | Actor | Ann Taylor | |
| Josh Harris | Actor | Tony Harris | |
| Dorian Lough | Actor | D.S. Satchell | |
| Andrew Havill | Actor | Clarence Oxley | |
| David Fleeshman | Actor | Fletcher | |
| Nicola Sanderson | Actor | Karen Hyam | |
| Kate Fahy | Actor | Meg Richards | |
| Pauline Munro | Actor | Mrs Cheshire | |
| Richard Addison | Actor | Clerk Of Court | |
| Huggy Leaver | Actor | Kenneth Poole | |
| Peter McNamara | Actor | Tom Harris | |
| Hakeem Kae-Kazim | Actor | D.C. Cranham | |
| Diana Fairfax | Actor | Magistrate | |
| David Gwillim | Actor | Clive Griffith | |
| Connor McIntyre | Actor | Mr Hall | |
| Helen McCrory | Actor | Anita Harris | |
| Corrina Preece | Actor | Receptionist | |
| Polly Kemp | Actor | Jury-Granger | |
| Donald Gee | Actor | Vicar | |
| Eluned Jones | Actor | Helen Hughes | |
| Mary Miller | Actor | Mrs Gillingham | |
| Jake Wood | Actor | P.C. Barridge | |
| George Pensotti | Actor | Judge Winfield | |
| Peggy Phango | Actor | Mrs Wald | |
| Lee Ross | Actor | Peter James | |
| Nicholas Blane | Actor | Waugh | |
| Terry Raven | Actor | Jury-Jewish Man | |
| David Hayman | Actor | D.Supt. Walker | |
| Colin Welland | Actor | Mallory | |
| Helena McCarthy | Actor | Enid Marsh | |
| Anne-Marie Duff | Actor | Cathy Gillingham | |
| David Kennedy | Actor | P.C. Phelps | |
| John Abbott | Actor | Usher | |
| Nicholas McGaughey | Actor | Terry Smith | |
| Richard Durden | Actor | John Foster | |
| Mitchell Ray | Actor | Jason Harris | |
| Kate Buffery | Actor | D.I.North | |
| Mo Sesay | Actor | Stephen Cookham |