MI5 suspects British atomic research has been infiltrated and asks Foyle to look into whether a Russian spy network could be at work in the heart of London.
Episode rating
Cast of episode
82
14
- Christopher Foyle
- Samantha Stewart
- Max Hoffman
- Professor Fraser
- Helen Fraser
- American Scientist
- Aleksei Gorin
- Arthur Valentine
- Frank Shaw
- Hilda Pierce
- Sir William Chambers
- Adam Wainwright
- Ruth Shaw
- Jack Shaw
- Tomasz Debski
- Duty Police Officer
- Marc Vlessing
- Det. Supt. Cranborne
- Woman on Stairs
- Radiation Soldier
- Soldier at Vlessing's
- Town Hall Official
- Glenvil Harris
- Cyril Conway
- Maureen Greenwood
- Jane Conway
- Russian Agent
- Self - Host
- Charlotte
- Hitman