On Lewis, officers are fighting the drug trade. Acting on intel, they raid a suburban home which they suspect is connected to dealing. In Inverness, a man with a knife has barricaded himself in his home, and police need to respond before it gets out of control. In Ardnamurchan, police intervene as tensions mount between a protester and a fish farm.

Police on Skye plan to raid an abandoned house that intelligence suggests may be a cannabis farm operated by a major drugs gang.

Elsewhere on Skye, officers must deal with a nasty three-car collision that has resulted in multiple injuries, cars on fire, and the island's main road being blocked for hours. And officers in Inverness give chase to a man who jumps out of a window.

Police deal with a tragic accident on the A9, one of the Highlands' busiest and most dangerous roads. Meanwhile, officers hunt for a wanted man in the dark forests near Fort William.

Police investigating the disappearance of a popular barman find human remains near Aviemore. In Caithness, cops are shocked to discover tropical animals in a derelict house.

A team of police travel to the Outer Hebrides to search through the snow for a missing 16-year-old. In Shetland, the cops have to deal with Viking revellers and a drunk driver.

Police in Inverness raid a flat and discover a laboratory containing a number of dangerous chemicals and electrical circuitry. They evacuate the area and call in the bomb disposal team.

PC Stephen Cooper co-ordinates a desperate search for two missing hillwalkers in Glencoe, and, in the Cairngorms, cops investigate a suspected shotgun attack on the nest of a protected bird of prey.

On the Isle of Lewis, a police officer confronts an angry fisherman who he suspects has been illegally poaching salmon. In Fort William, police respond to reports that a young woman is attacking a man with a knife.

Armed police target the operations of a violent county lines drug gang in Inverness. And in Glencoe, PC Stephen Cooper has to track down and detain a high-risk missing person.