Ten years ago Pam Thomas witnessed her parents' murders. The events were so terrifying and traumatic, she blocked out all the events of that night. Two weeks ago she began getting threats on her answer phone. Two days ago a dead rat was left on her doorstep with a note saying, she'd be next. Now she's gone missing. Detective Sergeant Katie Mitchell is assigned to take over the case when DCI Martin suffers a heart attack. With the aid of...