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.

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.

Detectives race to the scene of a violent attack on an island in the Hebrides, cops settle a dispute between two crofters, and an arrest is made in Shetland for a hate crime.

Officers in Kyle of Lochalsh conduct a search warrant on a flat of an elderly neighbour who they suspect is dealing Class A drugs.

Cops search for a young man lost in the foothills of the Cairngorms. In Inverness, a shocking hit-and-run sparks a hunt for a man and woman on a violent crime spree.

Torrential rain hits the Highlands, flooding roads and fields. As conditions worsen, a missing person search becomes a desperate manhunt.

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.

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

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.

The hunt for a missing person takes a turn as police find out he is wanted by another force. Meanwhile, Inverness CID raid two properties suspected of connections to county lines drugs gangs.

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