The ancient clan spirit is not yet dead in the Scottish highlands, with Donald MacDonald of Ben Nevis ruling the roost at wild, craggy Glenbogle Castle. Woe betide those who trespass on this Chieftain's kingdom. So when a hapless bunch of Sassenach hikers invades the glens, camping on Ben Nevis's beloved land and disturbing his prized grouse, they are in for the shock of a lifetime.