| Name | Character | Episodes |
|---|---|---|
| Owain Arthur | DS Keith Greener | 6 |
| Aisling Bea | Mari Butler | 6 |
| Richard Coyle | Thom Blackwood | 6 |
| Agyness Deyn | Detective Elaine Renko | 6 |
| Nikki Amuka-Bird | Grace Morrigan | 6 |
| Jim Sturgess | Detective Charlie Hicks | 6 |
| Derek Riddell | DCS Roland Bell | 6 |
| Varada Sethu | DS Mishal Ali | 6 |
| Tamara Smart | Hailey Hicks | 3 |