Discovering his late father's war diaries, Charles Copley learns that he had been involved in counter-intelligence. When Charles is approached by an organisation trying to buy the diaries, he refuses. But he is viciously attacked - and then his son is murdered... Seeking revenge, he is joined by Maria Wright, daughter of his father's wartime friend. They are led on a journey to the mountains of Montenegro - and thirty years back in time in search of a lost treasure.