The Avengers.S04E07.The Murder Market

Steed and Emma pose as eligible singles in order to infiltrate an assassination service posing as a matchmaking agency.
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Teleplay by Tony Williamson
Directed by Peter Graham Scott
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Guest Starring: Patrick Cargill, Suzanne Lloyd, Naomi Chance, Peter Bayliss, John Woodvine, Edward Underdown, Barbara Roscoe, John Forgeham