The Avengers · S6, E19
The Curious Case of the Countless Clues
In a spoof of Sherlock Holmes, Sir Arthur Doyle (Peter Jones) – equipped with pipe, cape and deerstalker hat – is investigating a seemingly careless criminal, who leaves masses of clues wherever he goes. But no one can solve the crimes, not even Steed - because all the clues are fakes: left behind by a blackmailer, who is planting them to incriminate wealthy men, as part of a sophisticated extortion racket.