Maybe it would get a ranking of Recommended for a library in the SW, but other than being set in a desert environment, with desert animals as the characters, I don’t find anything else particularly unique about it.  It tells the story of Old Armadillo waiting at home for the trick-or-treaters to come, but he gradually gives up and goes to bed because no one is coming, but outside they are all congregating and waiting for the rest of the gang to arrive.  Then they all ring his bell at once and they all have a party together.  The pictures are rather dark, which was probably intentional to set the Halloween mood, but I actually found them more gloomy than spooky.