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A brutal murder in an Inverness home sparks a manhunt for two violent suspects. Detectives recover crucial evidence beside a canal and track down CCTV, but the case takes a strange turn when they begin to doubt their main eyewitness. On Lewis, police face a stand-off with a camper van driver who insists the law doesn’t apply to her. And in the Cairngorms, an upturned canoe triggers a search for a missing man.

Police race to intercept a suspected drugs courier heading for Inverness station with a large suitcase, which is found to contain a huge quantity of cannabis. In Glencoe, officers hunt for a missing hotel worker feared to be in crisis, while a routine visit to check on a man escalates into a siege when he threatens to burn his home down.

A knife attack in Inverness leads police to a volatile suspect and a house packed with blades. On the Isle of Skye, rescuers race to find a climber who is missing in the mountains.