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London's federation of diamond merchants is being plagued by a vicious gang of smugglers. Steed and Cathy pose as husband-and-wife gem dealers in hopes of flushing out the villains. Ultimately, Cathy is targetted for death by the smugglers, but here as elsewhere, she proves to be up to the challenge. First telecast in England on December 1, 1962, Death on the Rocks was written by Eric Paice. The episode made its American cable-TV bow on February 7, 1961.