I See You

It’s the photo I’m looking at. It’s cropped close to the face but you can clearly see blonde hair and a glimpse of a black strappy top. Older than the other women pimping their wares, but such a grainy photo it would be hard to give a precise age. Except I know how old she is. I know she’s forty. Because the woman in the advert is me.
When Zoe Walker sees her photo in the classifieds section of a London newspaper, she is determined to find out why it's there.

There's no explanation: just a grainy image, a website address and a phone number. She takes it home to her family, who are convinced it's just someone who looks like Zoe. But the next day the advert shows a photo of a different woman, and another the day after that.

Is it a mistake? A coincidence? Or is someone keeping track of every move they make...