IT’s Sophia Lillis to star in Nancy Drew and the Hidden Staircase Deadline is reporting that Sophia Lillis, the young star of last year’s blockbuster IT, has been tapped by Warner Bros. to headline their potential franchise starter Nancy Drew and the Hidden Staircase. Based on the second of 175 books in the “Nancy Drew” series published since 1930, Lillis will portray the tireless title sleuth as she investigates a potentially haunted house and a missing landowner. Ellen DeGeneres, Jeff Kleeman, and Chip Diggins will produce Nancy Drew and the Hidden Staircase, with Wendy Williams executive producing.