you have noticed a man who has been at the same places as you for a month now.. You don't know the man. But he makes you feel uneasy when you see him

he's everywhere you go... With the same blank stare.. He's always staring at you to.. Which is more odd

one night you we're at home on your couch.. When suddenly you get a text from a unknown number.. Saying

Unknown number: "open the door for me. It's getting cold out here"

suddenly you hear a knock on your front door...