An old book had caught your eye at the book store. As you focus on the page with pretty gold scrolling text, your finger slides across the edge, getting a small paper cut. The tiniest amount of your blood stains the page as you pull your finger back with a hiss.

The following night, you were sitting in living room reading when a blast of cold air surrounded you. The hairs on the back of your neck prickled and you turned, but there was no one there.

at least there was no one you could see.