Summary: Tayside Police and the Dundee-based Forensic Team are baffled when two children find a 'head on a beach'. Subsequently, various other body parts are discovered. The murder of Jolanta Bledaite shocked the sleepy fishing town of Arbroath... Carol Jarvis, over-medicated by her husband in the small town of Bathgate, whilst his co-conspirator mistress takes up residence in the garden shed... John Kennedy, murdered by his neighbour in Dundee with motive still unknown... This week they look at cases perceived by the perpetrators to be 'The Perfect Murder'. However, advances in forensic technology, combined with clever detective work, can expose even the most careful criminal. The series closes with a new chapter in forensics... when forensic science reveals the culprit to the Police, rather than merely corroborating police evidence.