The Nutshell (The Avengers)

"The Nutshell"
The Avengers episode
Screen title
Episode no.	Season 3 Episode 4
Directed by	Raymond Menmuir
Written by	Philip Chambers
Produced by	John Bryce
Featured music	Laurie Johnson John Dankworth (theme)
Production code	3–4
Original air date	19 October 1963 (1963-10-19)
Guest appearance(s)
Bud Tingwell John Cater Patricia Haines Christine Shaw Edina Ronay Ian Clark
Episode chronology
← Previous "Man with Two Shadows" Next → "Death of a Batman"
List of The Avengers episodes

The Nutshell is the fourth episode of the third series of the 1960s cult British spy-fi television series The Avengers, starring Patrick Macnee and Honor Blackman. It originally aired on ABC on 19 October 1963. The episode was directed by Raymond Menmuir.

Steed and Cathy investigate espionage by a pretty burglar in "The Nutshell", codename for a top-secret underground nuclear shelter. They are not telling each other everything, and somewhere a traitor lurks.

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Wikipedia