The Lyell team return to the crime scene as another victim is in peril. Family ties are tested to their limits as they reveal the dark secrets that led to the tunnel collapse, and Jack is put in a difficult position when a blast from the past comes to visit.
| Name | Type | Role | |
|---|---|---|---|
| Michael Crompton | Writer | ||
| Josh Dynevor | Producer | ||
| Kirsty Hoiles | Guest Star | Hannah Coles | |
| Tom Christian | Guest Star | Philip Stratton | |
| Umi Myers | Guest Star | Emma Pryor | |
| Jemma Redgrave | Guest Star | D.I. Jill Raymond | |
| Nick Bartlett | Guest Star | John Pryor | |
| Dinita Gohil | Guest Star | Bela Nasir | |
| Rosina Carbone | Guest Star | D.S.I. Jennie Gibbs | |
| Nicholas Gleaves | Guest Star | Bob Stratton | |
| Janet Kumah | Guest Star | Donna Chainey | |
| Waj Ali | Guest Star | Anthony Barzani | |
| Aislín McGuckin | Guest Star | Aoife | |
| Edward Bennett | Guest Star | Malcolm Coles | |
| Anna Burnett | Guest Star | Frankie Stratton | |
| Joseph Beattie | Guest Star | Trevor Taylor | |
| Christine Lalla | Director |