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In the first installment of a two-part story, Robert Strauss is cast as Charlie Leach, a sleazy private detective. Hired by one of Darrin's clients to do a background check on Samantha, Charlie discovers that Sam is really a witch. But instead of reporting to his boss, Charlie makes a beeline to Sam, threatening to tell all if she doesn't pay him off. Written by Bernard Slade, part one of "Follow That Witch" was originally telecast on April 14, 1966.