A KGB agent defects to UK and offers information about Russian spies within the British Intelligence. Can he be trusted?
| Actor | Role |
|---|---|
 Joss AcklandVictor Rogachev | Victor Rogachev |
| DDavid MarkhamSir Norman Bleake | Sir Norman Bleake |
 Andrew BurtDavid Maitland | David Maitland |
| AAlex JohnstonCharles Pelling | Charles Pelling |
 Harry AndrewsSir James Croft | Sir James Croft |
| CConstantin de GoguelYevgenni Karyagin | Yevgenni Karyagin |
 Michael J. JacksonArcadi Zaitsev | Arcadi Zaitsev |
| BBarrie ShoreGalina Zaitsev | Galina Zaitsev |
 Bernard MilesSir Alec Ware | Sir Alec Ware |
| PPreston LockwoodSir Michael Bamsford | Sir Michael Bamsford |
| RRichard HamptonIan Robertson | Ian Robertson |
| KKevin ElyotBernard Ogilvy | Bernard Ogilvy |
 Oliver Ford DaviesDoctor | Doctor |
| KKate LeeNadia | Nadia |