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Emma goes undercover as a department store clerk when a sales receipt is found on the body of a murdered agent. She is backed up by Steed, who poses as an efficiency expert. In their own inimitable fashion, the Avengers discover a plot to blow up London -- with the department store itself as the weapon. Written by Brian Clemens, "Death at Bargain Prices" first aired in England on October 23, 1965, then debuted in America on April 11, 1966.