| When they were twelve years old, Mark, Pru, Danny and Slade were out together in the park. Mark’s five-year-old brother, Jesse, was annoying them. They were mean – told him to get lost. Jesse ran away. He was gone. Never seen again. Twenty years later, Danny – now a detective – learns some shocking news. Jesse’s DNA has been found at a murder scene. He is alive and out there. Somewhere. |
| Name | Character | Episodes |
|---|---|---|
| Geraldine James | Julie Wells | 10 |
| Lee Ingleby | Slade | 10 |
| Sarah Solemani | Pru Carew | 10 |
| Hannah Arterton | D.C. Ally Caine | 10 |
| O-T Fagbenle | Danny Kenwood | 10 |
| Tom Cullen | Mark Wells | 10 |
| Lola Mae Loughran | Chrissie | 10 |
| Michael Maloney | Alan Wells | 9 |
| Sophia La Porta | Britnay Shearer | 8 |
| Rade Šerbedžija | Jákob Marosi | 6 |
| Barnaby Kay | D.I. Liam Townsend | 5 |
| Jonathan Kerrigan | Stuart Carew | 5 |
| Lorraine Burroughs | Jennifer Kenwood | 5 |
| Don Warrington | Ray Kenwood | 4 |
| Honeysuckle Weeks | Laura Marshall | 4 |
| Kim Allan | Jane Shilling | 4 |
| Charles De'Ath | Dominic Porter | 3 |
| Saoirse-Monica Jackson | Sasha Manley | 3 |
| Lee Boardman | Jay Newman | 3 |
| Niall Greig Fulton | Richard Payne | 3 |
| Alexa Davies | Alexa | 2 |
| Seeta Indrani | Dr. Khan | 2 |
| Naomi Ackie | Gemma Morgan | 1 |