Also not in novel form, but Twain was featured in an episode of Touched by an Angel in 1997 ( http://sharetv.org/shows/touched_by_an_angel/episodes/392035/04x12) in which the angelic regulars on the show encounter Twain in his late years and try to convert him from his pessimism. Unsuccessfully, to the distress of the angels. Who turn sour and get discouraged. They have to go on meds and get help. That's the next episode. I don't think it was ever aired. Jean is in the episode, too, and Kate Leary. Terry Oggel