England is on the brink of a devastating war with France that will last over a hundred years. A terrible plague which will wipe out a third of Europe's population before it is done is spreading. Caris, a visionary young woman, struggles to rise above the suffering and oppression in order to lead her people out of the Dark Ages. With her lover Merthin, she builds a community in Kingsbridge that stands up to the church and the crown. Together, they unearth a dangerous secret and must fight to save their town from ruin, ultimately ushering in a new era of freedom, innovation and enlightenment.