I believe it is called "The Book" by Hans Anderson. It was featured in a podcast called "Ghost Stories" from Love and Radio that airs on different NPR stations. You can find it here, but you'll have to create an account to listen to the entire thing, they only post a snippet: PRX » Piece » The Book
If you don't want to set up an account, you can listen to the whole podcast here, your story is the fifth selection at 17 minutes in: Ghost Stories by Love + Radio on SoundCloud - Create, record and share your sounds for free
I'm listening to it now, it is creepy.