The revelation that Flannery's first wife also died of a stair fall sends Harry to Prague to seek more evidence.
| Name | Type | Role | |
|---|---|---|---|
| Ed Whitmore | Writer | ||
| Sarah Winman | Guest Star | Dr Lucy Prentiss | |
| Josephine Butler | Guest Star | Bridget Flannery | |
| Souad Faress | Guest Star | Diamanda Yannis | |
| Emily Beecham | Guest Star | Anna Flannery | |
| Mia Zillwood-Hunt | Guest Star | 6yr old Anna Flannery | |
| Tim Treloar | Guest Star | DS Simon Vedder | |
| Simone James | Guest Star | Katie Thomson | |
| Aljaž Tepina | Guest Star | Martin Klosk | |
| Stuart McQuarrie | Guest Star | Derek Tripp | |
| Jessica Regan | Guest Star | PC Justine Gould | |
| Nikki Amuka-Bird | Guest Star | Det Supt Gaynor Jenkins | |
| Julian Rivett | Guest Star | Cellmate | |
| Emily Joyce | Guest Star | Muriel | |
| Stéphane Cornicard | Guest Star | Francois Dupont | |
| John Lynch | Guest Star | Tom Flannery | |
| Michael Pennington | Guest Star | Professor Pavel Vetchy | |
| Peter Hamilton Dyer | Guest Star | Coroner | |
| Shenagh Govan | Guest Star | Nurse | |
| Deborah Findlay | Guest Star | Gemma King | |
| Thaddeus O'Sullivan | Director |