Loch Ness may be known for its monster but there's a hell of a lot more creepier things happening around the famous Scottish lake in this series. Tonight marks the final episode of The Loch, where Detective Annie Redford is determined to track down this serial killer tormenting the town. Another body is found tonight but a photo in his wallet provides a vital clue. Annie tries to gather further evidence by talking to a desperate Mhari, who refuses to believe the terrifying possibility she is presented with. Elsewhere, Albrighton is threatened with arrest by Quigley, but nevertheless, continues to pursue his own theory about the killings - even if it means putting his life on the line.