The story of how the modern world intrudes in a surviving prehistoric arcadia and how the ancient ways absorb it and continue.
There is a part of Britain unchanged for millennia, hilly and densely wooded, and bypassed almost entirely by all invaders for over three thousand years. It is a place where the old beliefs regarding nature and fertility and the need for sacrifice have continued into modern times, where a brother and sister farm in the same location where their family has lived through all those years, as evidenced by a bronze age round barrow visible from the windows of their home.
Into their world come two strangers. Both, in their different ways, will become a part of that ancient world, the girl by being assimilated into the family, the man as proof that more than the physical remains of that past have survived, and that the old ways have continued into the present and life and beliefs will go on into the future.