The Great Divorce features ghosts and is very much Lewis' type of blunt analogy. I say "blunt" not as a criticism, but as a simple statement. Ghosts are coached by other ghosts about being a ghost. While they do, they bring up the different ways people hide themselves from their true potential found with God. The Abolition of man features less ghosts. Maybe the ghosts are a bit silly, but it gets the point across rather well. Points off for his unflattering portrayals of women, which included woman nagging her husband to do better and another woman who's main fault was wanting to attract everyone. These examples aren't really needed. There was an entirety society of people pestering women to not nag and not be vain in the mid 20th century. Lewis didn't need to pile on these stereotypes.