| What starts out as a simple, reckless mid-life affair between a genetic scientist named Yvonne and a Westminster paper pusher takes an intriguing turn when she realizes he’s a spook – then suddenly gets very dark indeed. A provocative study of obsession, longing and just how far down a criminal path desire can take you. |
| Name | Character | Episodes |
|---|---|---|
| Emily Watson | Yvonne Carmichael | 4 |
| Lydia Leonard | Bonnard | 4 |
| Ben Chaplin | Mark Costley | 4 |
| Susan Lynch | Susannah | 4 |
| Mark Bonnar | Gary Carmichael | 4 |
| Steven Elder | George Selway | 4 |
| Olivia Vinall | Carrie Carmichael | 4 |
| Anneika Rose | Dr Sadiq | 1 |
| Helen Anderson | Select Committee Chair | 1 |