You were at home reading a thriller when it became late at night. You were reading a story about a main character who was being followed. The book was covering your face when you had fallen asleep at some point during the night. When you awoke, you discovered the book had been moved from your face to your nightstand, which was strange because you didn't remember putting it there. The note slipped out as you opened the book, and you read it

The last thing you know someone was stalking you.