After the body of a missing boy called Matty Wallace is found in local woodland the police investigate. Jane , his mother, claims that she didn't realise he was missing until she went to his school. His stepfather says he has been working away for several days and knew nothing of the boy's disappearance. Following further investigation and the results of the postmortem, the team begin to think that Jane may hold the key to her son's death. (thetvdb.com)