Samuel Fennan, diensthoofd op het Ministerie van Buitenlandse Zaken, wordt ervan verdacht banden te hebben met de Oostbloklanden en pleegt zelfmoord. De Britse overheid wil een schandaal vermijden en geeft geheim agent Charles Dobbs opdracht de zaak discreet te onderzoeken. Dobbs ontdekt echter een aantal curieuze feiten.
Nee, helaas is The Deadly Affair nog niet beschikbaar op Netflix in Nederland.
| Directing | Sidney Lumet | Director |
| Production | Sidney Lumet | Producer |
| Writing | Paul Dehn | Screenplay |
| Camera | Freddie Young | Director of Photography |
| Editing | Thelma Connell | Editor |
| Sound | Quincy Jones | Original Music Composer |
| Production | Denis O'Dell | Associate Producer |
| Production | James Liggat | Casting |
| Art | John Howell | Art Direction |
| Costume & Make-Up | Cynthia Tingey | Costume Design |
| Sound | Chris Greenham | Sound Editor |
| Camera | Brian West | Camera Operator |
| Lighting | Jock Napper | Gaffer |
| Costume & Make-Up | Betty Glasow | Hairstylist |
| Costume & Make-Up | Jill Carpenter | Makeup Artist |
| Art | Percy Godbold | Property Buyer |
| Writing | John le Carré | Novel |
| Art | Pamela Cornell | Set Dresser |
| Directing | Ted Sturgis | Assistant Director |
| Camera | Kenneth J. Withers | Focus Puller |
| Sound | Gerry Humphreys | Sound Recordist |
| Sound | Les Hammond | Sound Recordist |