Tony Robinson walks from Melrose in the Scottish Borders to Holy Island off the coast of Northumberland, exploring the history of Northumbria. Over five days, he goes on the trail of one of the ancient kingdom's greatest sons - Saint Cuthbert. Through the Tweed Valley and across the Cheviot Hills, it's a journey through a murky history laden with myth. However, by investigating the communities, power bases and landscape of seventh-century Northumbria, Tony aims to understand the pagan land in which Cuthbert spread his simple brand of Celtic Christianity.