| Samuel, a Russian-born Jewish inventor who specialises in the development of hearing aids, is tasked with a secret mission by MI5 to use his technological expertise to contribute to western Cold War efforts. Following the tensions of the space race and the first hydrogen bomb test, Samuel's efforts factor in to the emergence of the modern world. |
| Name | Character | Episodes |
|---|---|---|
| Keeley Hawes | Kathleen Shaw | 6 |
| Gary Beadle | Courtney Johnson | 6 |
| Linus Roache | Richard Shaw | 6 |
| Toby Stephens | Samuel Petrukhin | 6 |
| Timothy Spall | Lord Arthur Wallington | 6 |
| Claire Bloom | Aunt Mary | 6 |
| Lucy Cohu | Miriam Petrukhin | 6 |
| Mark Bonnar | Field | 6 |
| Rose Ayling-Ellis | Esther | 5 |