Nell Sweeney has led an ordinary life. Every day she walks to and from the hospital where she works as a nurse, believing that no harm can befall her. Until one day she is taken. Because someone out there has a secret. Someone out there has been watching Nell - and they've been watching others like her too. Nell is the unlucky one - she was in the wrong place at the wrong time. And if she isn't found soon, someone will make sure that she isn't the last woman to be taken...
