What is the scariest book ever written?

Almost anything written by Stephen King and some of Edgar Allan Poe's work has been known to cause nightmares also.

Answer:

The one story that gives me chills every time I read it is called The Mist. It's a short story written by Stephen King and will soon be out in theaters.

Personally, the book that I have read that was thought of as a horror was Winnie the pooh hundred acre woods the owl made me soil myself.