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.

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.