A woman's body found in the Thames leads Nikki and Jack to a riverside community scarred by grief after the disappearance of a teenage girl three years ago.
| Name | Type | Role | |
|---|---|---|---|
| Graham Mitchell | Writer | ||
| Kate McLaughlin | Guest Star | Ruth Tresize | |
| Claire Rafferty | Guest Star | Sarah Logan | |
| Mufrida Hayes | Guest Star | Jean | |
| Harris Dickinson | Guest Star | Aaron Logan | |
| Melissa James | Guest Star | Zoe | |
| Lewis Griffin | Guest Star | Kieran Vale | |
| Morgan Watkins | Guest Star | Ben Logan | |
| Nav Sidhu | Guest Star | DS Carl Pope | |
| Edward Bourne | Guest Star | Young Ben Logan | |
| Bartley Burke | Guest Star | Shaun Cohen | |
| Saria Steyl | Guest Star | Natasha Hill | |
| Eva Pope | Guest Star | DI Heather Ashton | |
| Rhoda Ofori-Attah | Guest Star | Stella Tuffour | |
| Jo Stone-Fewings | Guest Star | Chris Tresize | |
| Tom Carter | Guest Star | Young Aaron Logan | |
| Sarah Smart | Guest Star | Ali Tresize | |
| David Richards | Director |