Northern Britain, Iron Age. Rian, a carefree young woman and promising apprentice healer, is enslaved by a spiteful trader and forced aboard a vessel to embark on a perilous sea voyage. They are in search of the fabled hunter known as the Walrus Mutterer, to recover something once stolen. The limits of Rian's endurance are tested not only by the cruelty of her captor, but their mysterious fellow passenger Pytheas The Greek - and the merciless sea that constantly endangers both their mission and their lives. A visceral evocation of ancient folklore and ritual, The Walrus Mutterer introduces an unforgettable cast of characters in an extraordinary, vividly imagined Celtic world.