Bomb disposal are called in when a chemical lab is found in a flat. police search for missing walkers in Glencoe, and wildlife cops investigate an attack on a bird of prey.

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.

The county lines drug epidemic has taken further hold in Inverness, bringing increased violence and drugs deaths. Specialist CID officers bust down doors in search of the gangs.

Police on the Isle of Lewis raid the home of a suspected drug dealer. In Inverness, a man with a knife is causing chaos.

On the Isle of Skye, experienced climber Frank has gone missing in the mountains. As the weather closes in, police desperately search for clues to discover his exact route.

A bushcraft expert is reported missing in remote Sutherland. The officers battle to uncover which route he took before a blizzard sets in.

Officers on Skye struggle to keep a royal visit from the future king under wraps.

Officers on Skye are tipped off about a resident suspected of possessing an illegal weapon, and dangerous winds in Harris cause a road traffic incident.

An experienced hiker has not returned from the top of a mountain on Skye, and a concealed attic in Dingwall reveals evidence of a cannabis-growing operation.

On the Isle of Lewis, police hunt for suspected salmon poachers. In Glencoe, PC Stephen Cooper pursues a missing person case, and in Inverness, cops conduct drug raids in the city.