Twelve years ago, the six of us were young and carefree, getting ready to celebrate Christmas. We had the house to ourselves: no parents, nobody telling us to behave. We just had to look after Seffie , my friend Gabby’s little sister. We thought she was tucked up safely in her lilac pyjamas, sleeping through the music. We were wrong. The next morning, when we went to wake her, her bed was empty. She was never seen again. And no one ever found out why… Twelve years later, I receive a call from Gabby, inviting me to spend Christmas at her remote Scottish lake house. None of us have spoken since the night that Seffie disappeared, and part of me knows I shouldn’t go. But Gabby says we need to be together to help us move on. Yet as soon as I arrive, it becomes clear that she has another reason to bring us all together. She claims one of us knows what happened to her little sister. And, as a snowstorm traps us in the house, she’ll stop at nothing to get to the t...