Time-travelling schoolboy Jack Spurling has been given an intriguing document from the distant past. It tells of an event in Ancient Greece which led to treasure being found and stashed away for safekeeping. Helped by an enthusiastic history teacher, he sets out to solve the mysteries behind it, but knows it will be an even more demanding task than his first journey back to the ancient world. He has learnt from that first foray into the past but will it be enough? Has he the resources at his disposal to find the answers he seeks?