This is a large picture book with fabulous cartoon type illustrations by Chris Gall.  It’s the humorous accounting of a day in the classroom at a school where the regular teacher doesn’t show up, and instead, a substitute.  This is no ordinary substitute teacher, it’s actually a substitute creacher.  (The “T” in teacher was erased from the blackboard and a “Cr” was added to the remainder of the word).  This substitute creacher has eyes in the back of his head, appears to be somework of space alien.  The creacher warns the kids with tales of doom regarding previous misbehaving students.  Then he tells the story of a bully who stole Halloween candy from a magical gnome and the gnome cursed him with forever looking like the “creacher” his was dressed up as.  Yes, it was the teacher himself! The students feel sorry for the substitute and he passes out candy to make up for his error and on the way home offers one to an elderly man, who happens to be the gnome.  All is forgiven and the creacher transforms back into a boy and returns to his childhood home.