- Genres Action, Drama, Suspense, Thriller
- Runtime 45 minutes
- Total runtime 4 hours 30 minutes
- Status Continuing
- Network Channel 4
- Showrunner Bathsheba Doran
In London in the aftermath of WWII, an English civil servant is seduced by a rogue American spy into spying on her own country—in order to uncover a Russian agent in the heart of the British Government.