The twisty, gripping number one bestseller from Richard and Judy Book Club winner Clare Mackintosh, author of I Let You Go.

Winner of the Richard and Judy Summer Book Club 2017

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...

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.