We read
Twelve Haunted Rooms of Halloween
,
a cute Halloween story told in the style of "The Twelve Days of Christmas". Believe it or not (which I hardly do), the kids like it because I sing it. You can also search the illustrations for the 12 trick-or-treaters, 11 spiders spinning, etc., so it's also good counting practice. Plus there's some bonus things to find throughout the book on the last page. This is pretty tame for Halloween so it's good for preschoolers who like just a little scare factor.