Is Horror an appropriate Genre for a Children’s Picture book?

At what age should I introduce my child to Stephen King’s world of horror, said no parent ever. Yet here we have King’s first attempt at a children’s picture book, Charlie the Choo-Choo.  It is, of course, a trick. Yes, this is a children’s book in its own right, but it has a much darker … More Is Horror an appropriate Genre for a Children’s Picture book?