When Cairngorm Mountain Rescue Team respond to a report of a downed helicopter on the frozen Loch Avon they discover two bodies in the gruesome wreckage, one of whom is later identified as a Norwegian government official. While searching the site, the bodies of three climbers are found in a nearby cave having frozen to death. Sensing foul play, forensic expert Dr Rhona MacLeod is brought in to investigate. Meanwhile in Glasgow, DS Michael McNab raids a private members club looking for cocaine but instead finds young women partying with the city's elite. Questioning the women reveals they were smuggled into Scotland via Norway and that the crashed helicopter on Cairngorm may be linked to the trade.
