A young Australian travelling for academic purposes in Europe visits a monastery in Spain and is waylaid by an old man selling his produce by the roadside at a nearby war cemetery. He innocently asks about the massive eucalypt trees in the monastery grounds and is then entranced by the old man and the story he tells of their history which weaves together the secret 16th-century exploration of Terra Australis, the Emperor Charles V, the dedication of a botanist, fundamentals of gardening and the wonder of Nature.