This is a perfect little horror story in two sentences:
INSTRUCTIONS ON or rather EXAMPLES OF HOW TO BE AFRAID
In a small town in Scotland they sell books with one blank page hidden somewhere within the volume. If the reader opens to that page and it’s three o’clock in the afternoon, he dies.
There’s more where that came from. Hat tip to Svetlana for the pointer to Cronopios and Famas, by Cortázar.