American millionaire Chester Royde is in Scotland with his new bride Carrie and sister Myrtle to research Carrie's Scottish ancestry. Their new 'relatives' turn out to be rather more authentically Scottish than they bargained for. Ben Nevis, Laird of Glenbogle Castle, is cash-strapped and fiercely protective of his lands and the Macdonald clan spirit, but he's not above attempts to marry heiress Myrtle to one of his brawny sons. When a group of hikers stumble on his moor and spoil a day's hunting, it sparks an all-out war between gentry and commoners.