What if your best friend's child disappears? And it was all your fault. This is exactly what happens to Lisa Kallisto, overwhelmed working mother of three, one freezing December in the English Lake District. She takes her eye off the ball for just a moment and her whole world descends into the stuff of nightmares. Because, not only is thirteen-year-old Lucinda missing, and not only is it all Lisa's fault, but she's the second teenage girl to disappear within this small tightknit community over two weeks.