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Unbeknownst to Keel, Steed uses him as the courier for a new medical formula, printed on a tiny microdot. Arriving at a Swiss medical convention, Keel hands over his conference card (containing the microdot, of course) to a young lady of his acquaintance. Thus the girl finds her life in danger, while Keel comes face to face with the person who framed him for murder in the previous week's episode. First telecast April 29, 1961, "One for the Mortuary" was written by Brian Clemens.