When the Famous Five go camping, in the company of Julian and Dick's eccentric school-teacher: Mr Luffy, surely they can't fall into adventure, in the quiet and lonely moorland that surrounds them? But, of course, somehow, they manage too, and find themselves on the trail of Spook Trains that appear, out of nowhere, in the dead of the night! Accompanied by their new friend, from a local farm: Jock, they venture out into the night, to investigate the extraordinary appearance of these peculiar trains, only to expose themselves to some of the most dangerous criminals they have faced, yet...