K.C.
http://www.amazon.com/Monsters-Love-Underpants-The-Books/...
http://www.amazon.com/Creepy-Carrots-Aaron-Reynolds/dp/14...
http://www.amazon.com/Monster-Needs-Costume-Me/dp/1938063...
http://www.amazon.com/Goodnight-Goon-Petrifying-Michael-R... (There are actually quite a few parodies of classic children's books they might enjoy ... A very hungry zombie, runaway mummy, the spooky wheels on the bus).
http://www.amazon.com/Gus-Was-Friendly-Ghost/dp/193090074...
Or there's always a Virginia one .... http://www.amazon.com/Halloween-Scare-Virginia-Eric-James...