| Name | Character | Episodes |
|---|---|---|
| Ella Purnell | Hester Argyll | 3 |
| Bill Nighy | Leo Argyll | 3 |
| Alice Eve | Gwenda Vaughan | 3 |
| Matthew Goode | Philip Durrant | 3 |
| Morven Christie | Kirsten Lindstrom | 3 |
| Eleanor Tomlinson | Mary Durrant | 3 |
| Anna Chancellor | Rachel Argyll | 3 |
| Frances Grey | Lydia Gould | 3 |
| Christian Cooke | Mickey Argyll | 3 |
| Anthony Boyle | Jack Argyll | 3 |
| Luke Treadaway | Dr. Arthur Calgary | 3 |
| Brian McCardie | Bellamy Gould | 3 |
| Sandy Welch | Dr. Edwin Morsuch | 2 |
| Stuart McQuarrie | Doctor | 1 |