Two startling revelations about long-hidden work by "To Kill a Mockingbird" author Harper Lee have stunned readers awaiting Tuesday's release of her new book, "Go Set a Watchman." Lee's attorney, Tonja Carter, hinted Monday in an op-ed in the Wall Street Journal that the reclusive author may have written a third novel. Carter wrote that she recently examined the contents of a safe-deposit box in Lee's hometown of Monroeville, Alabama, and saw the manuscript for "Watchman" lying "underneath a stack of a significant number of pages of another typed text." "Was it an earlier draft of 'Watchman,' or of 'Mockingbird,'...