Nikki conducts an unusual post-mortem, and a terrifying discovery disturbs the team. DNA evidence forces the Lyell to seek advice from an unexpected quarter.
| Name | Type | Role | |
|---|---|---|---|
| Kathrine Smith | Writer | ||
| Neil Bell | Guest Star | Matty Boyce | |
| Preslav Shipkaliev | Guest Star | Stefan | |
| Kim Durham | Guest Star | Kenneth Rose | |
| Anneika Rose | Guest Star | Lucy | |
| Kerrie Hayes | Guest Star | Faith | |
| Jane Steel | Guest Star | Radio 4 Newsreader | |
| Phil Deguara | Guest Star | Gavin Rose | |
| Anay Kamble | Guest Star | Josh | |
| Anton Valensi | Guest Star | Perry | |
| Gloria Obianyo | Guest Star | DS Blake | |
| Ava Hinds-Jones | Guest Star | Amber | |
| Tamzin Outhwaite | Guest Star | Sally | |
| Raj Ghatak | Guest Star | Dev Shah KC | |
| Cal MacAninch | Guest Star | David Whitley | |
| David Angland | Guest Star | Liam | |
| Lisa Palfrey | Guest Star | DI Fisher | |
| Nicky Goldie | Guest Star | Judge Gibbs | |
| Abdul Sulaiman | Guest Star | Dylan | |
| Sallie Aprahamian | Director |