After a gruelling academic year, head teacher Harper MacDonald is looking forward to a summer holiday trekking in Nepal. However, her plans are scuppered when wayward niece, Ariel, leaves a note announcing that she’s running away with a boy called Pen. The only clue to their whereabouts is a I’ll be in Scotland. Cue a case of mistaken identity when Harper confronts the boy’s father - Rocco Penhaligon, and accuses him of cradle snatching her niece and ruining her future. At loggerheads, Harper and Rocco set off in hot pursuit of the teenagers, but the canny youngsters are always one step ahead. And, in a neat twist, it is the adults who end up in trouble, not the savvy teenagers.