| Name | Character | Episodes |
|---|---|---|
| Roger Allam | Antoine Verlaque | 3 |
| Patricia Hodge | Florence Bonnet | 3 |
| Keala Settle | Hélène Paulik | 3 |
| Nancy Carroll | Marine Bonnet | 3 |
| Geff Francis | Francois Roussell | 3 |
| Kirsty Bushell | Sylvie | 3 |
| Samuel Barnett | Didier Laurent | 2 |
| John Light | Dr. Marcel Vannier | 1 |
| Jonathan Aris | Lucien de Bremont | 1 |
| Jeremy Clyde | Georges Moutte | 1 |
| Robbie Gee | Max Audigier | 1 |
| Flora Montgomery | Isabelle de Bremont | 1 |
| Cara Horgan | Élodie Liotta | 1 |
| Lizzy McInnerny | Maria Pogarovsky | 1 |
| Sara Powell | Cosette Faraud | 1 |
| Scott Chambers | Claude Ossarte | 1 |
| Paul Bazely | Bernard Rodier | 1 |
| Louise Delamere | Claire Rocchia | 1 |
| Benedict Clarke | Yann Falquero | 1 |
| Leila Mimmack | Audrey Zacharie | 1 |
| Holli Dempsey | Delphine Jourdain | 1 |
| Melanie Gutteridge | Béatrice de Keppel Valois | 1 |
| Alex Felton | Sebastien Lapierre | 1 |