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...If you like Shari Lapena, Paula Hawkins, Rachel Abbott, B A Paris, Fiona Barton, Ruth Ware and CL Taylor, you'll love this gripping psychological thriller.