Fourteen years ago, our family holiday ended in tragedy when my darling four-year-old girl was snatched from us on the beach. Not a day goes by when I don’t picture her wide brown eyes, and the freckles dusting her cheeks. I only looked away for a second, and I have never forgiven myself.

Today, a seventeen-year-old girl has walked into a police station near our house. She says she’s my daughter. Abigail is back. I can’t believe it. After years of grieving, my family is finally complete again.

This should be the happiest moment of my life, but something doesn’t feel quite right. As hard as I try, I don’t know the teenager in front of me. Then holes appear in Abigail’s story, her accent starts to slip, and I catch her faking tears for the journalists outside – and I’m more certain than ever that she is not my daughter. That she is a stranger. And that we cannot trust her…

But if this mysterious girl isn’t Abigail, then who is she – and what does she want with my family?