Mary Jordan is walking along the street when she spots a sign.

If you are reading this, I am watching you.

You are now part of my collection.

You will be mine, and your life will never be the same again.

Mary is horrified. Her skin crawls at the idea of being watched.

She searches the buildings, looking for a face at a window.

But only for a moment. There's nothing to fear. It's obviously just a harmless prank.

She could not be more wrong...