This is a story of saints and spies, of fishermen and pirates, traders and marauders - and of how their wild and daring journeys across the North Sea built the world we know. When the Roman Empire retreated, northern Europe was a barbarian outpost at the very edge of everything. A thousand years later, it was the heart of global empires and the home of science, art, enlightenment and money.

We owe this transformation to the tides and storms of the North Sea. The water was dangerous, but it was far easier than struggling over land; so it was the sea that brought people together. Boats carried food and raw materials, but also new ideas and information.

The seafarers raided, ruined and killed, but they also settled and coupled. With them they brought new tastes and technologies - books, clothes, manners, paintings and machines. In this dazzling historical adventure, we return to a time that is largely forgotten and watch as the modern world is born.

We see the spread of money and how it paved the way for science. We see how plague terrorised even the rich and transformed daily life for the poor. We watch as the climate changed and coastlines shifted, people adapted and towns flourished.

We see the arrival of the first politicians, artists, lawyers: citizens. From Viking raiders to Mongol hordes, Frisian fishermen to Hanseatic hustlers, travelling as far west as America and as far east as Byzantium, we see how the life and traffic of the seas changed everything. Drawing on an astonishing breadth of learning and packed with human stories and revelations, this is the epic drama of how we came to be who we are.