The team pieces together the mystery of a man found dead on the shore of the Thames, while the life of a disgruntled criminology professor begins to unravel.
| Name | Type | Role | |
|---|---|---|---|
| Timothy Prager | Writer | ||
| Ashley Margolis | Guest Star | Haidar Alam | |
| Richard Keep | Guest Star | Harrison Cairney | |
| Diveen Henry | Guest Star | Elaine | |
| Isobel Wood | Guest Star | Celeste Locke | |
| Harry Lister Smith | Guest Star | Homeless Man | |
| Julie Jupp | Guest Star | Woman with Dog | |
| Maeve Courtier-Lilley | Guest Star | Vanessa | |
| James Craze | Guest Star | Roy | |
| John Thomson | Guest Star | DI Warren Bull | |
| Kaye Wragg | Guest Star | Valerie Fullerton | |
| Kevin McNally | Guest Star | Professor Peter Cherry | |
| Emily Piggford | Guest Star | Professor Elizabeth Newport | |
| Tracey Rooney | Director |