Nikki investigates a top paediatric surgeon with an unusually high mortality rate.
| Name | Type | Role | |
|---|---|---|---|
| Tony McHale | Writer | ||
| Jo Anne Nighy | Guest Star | Caroline Thomlinson | |
| Michael Feast | Guest Star | Martin Huston | |
| Barry Ward | Guest Star | Ashley Harris | |
| Evelyn Duah | Guest Star | Linda Hayter | |
| Jack Ashton | Guest Star | James Fetherton | |
| Alex Blake | Guest Star | Roger Davis | |
| Paul Bentall | Guest Star | Philip Benson | |
| Elizabeth Chan | Guest Star | Imogen Westerlake | |
| Tanya Moodie | Guest Star | DI Helen Lawlor | |
| Patricia Gannon | Guest Star | Diane Davis | |
| Caoimhe Murdock | Guest Star | Daisy Turner | |
| Jamie Parker | Guest Star | Alan Peters | |
| Richard Standing | Guest Star | DS Paul Sangar | |
| Richard Rees | Guest Star | Craig Fox | |
| Dylan Charles | Guest Star | Jason Arney | |
| Ania Sowinski | Guest Star | Claire Kowalski | |
| Natasha Little | Guest Star | Alice Huston | |
| Laura Power | Guest Star | Zoe Welsh | |
| Diarmuid Lawrence | Director |