Several operatives from MI12 have gone missing, the latest being Roger Jarret. When the avengers arrive at his flat they find his corpse but are observed by window cleaner Maskin, who works for the Classy Glass window cleaning agency. The avengers visit the company's offices to be told that they had given up the contract to clean MI12's windows some time ago. However they soon discover that somebody is using the privileged position of being able to spy on spies undetected and expose the leader of the gang.
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Did You Know?
This is the only episode in which Rhonda speaks. She has the one line "What?", spoken simultaneously with Steed and Tara. See more
Apostrophe mistake on the book cover in the tag sequence. See more
It's not every assassin who carries his own ladder.