The killing of a narcotics courier provides newly promoted Detective Superintendent Colin Thane of the Scottish Crime Squad with his first firm lead to an illegal drugs laboratory. But his investigation takes him to a prosperous malt whisky distillery in remote countryside, where Thane discovers that he isn't alone in his search for the drugs haul. The lovely hills near Aviemore become a long, nightmarish stalk, with death in wait for the loser...