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Cathy poses as a journalist to find out why a circus clown (Robert Rietty) is trying to murder Steed. It turns out that the clown is a functionary of the Mafia, and that Steed is getting too close for comfort to the "organization's" American drug-smuggling operation. It also turns out that the clown wants to escape the clutches of the Mafia himself. . .or does he? Originally telecast in England on March 2, 1963 (and finally shown in America on February 27, 1991), "Conspiracy of Silence" was written by Roger Marshall.