In "The Disappearance of Shere Hite," Oscar-nominated director Nicole Newnham ("Crip Camp") profiles the sex researcher who soared to success in the 1970s, but then faded into obscurity. Pure Nonfiction host Thom Powers talks to Newnham about navigating Hite's complex personality, how the film team uncovered the author's private writings and brought them to life with the collaboration of Dakota Johnson.