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Steed is assigned to transport a shipment of live corneas to Switzerland to be used in a delicate eye-graft operation. But when one of the surgeons involved is murdered, Steed and Cathy uncover a sinister plot involving a sightless millionaire (John Carson). Also figuring in on the proceedings is a cache of valuable jewels. Written by Martin Woodhouse, "Second Sight" was originally broadcast in England on November 16, 1963; it remained unseen in America until March 14, 1991.