American author Mark Twain attempted to write a book titled The Mysterious Stranger.He worked on it sporadically between 1897 and 1908. Each of the stories that Mark Twain authored features a paranormal figure known as "Satan" or "No. 44." The versions were all still unfinished (with the debatable exception of the last one, No. 44, the Mysterious Stranger). The Chronicle of Young Satan is around 55,000 words long, Schoolhouse Hill is 15,300 words long, and No. 44, the Mysterious Stranger is 65,000 words long. Mark Twain's Mysterious Stranger Manuscripts, edited by William M.Gibson, was first published in 1969 by the University of California Press as part of The Mark Twain Papers Series.It was later reissued in 2005. A popular edition of No. 44, The Mysterious Stranger, was also published by the University of California Press in 1982.The Phantom Stranger from DC Comics and the Mysterious Stranger share a lot of similarities.Both individuals have hazy backstories that leave room for the theory that they are exiled angels.