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Steed and Emma investigate when several top executives are murdered, and their secretaries are given major promotions. The cause of it all is an aggressively anti-male band of secretaries, led by a puppet named Henrietta. To flush out the villainesses, Steed poses as a big businessman, while Emma pretends to be. . .guess what? Written by Brian Clemens, "How to Succeed. . .at Murder" was originally telecast in England on March 19, 1966, then showed up on American television June 13, 1966.