Today, hardly a month passes without some dramatic and sometimes tragic discovery being made along the old killing fields of the Western Front. Graves of British soldiers buried during battle - still lying in rows seemingly arm in arm or found crouching at the entrance to a dugout; whole 'underground cities' of trenches, dugouts and shelters have been preserved in the mud; field hospitals carved out of the chalk country of the Somme marked with graffiti;...

It is high summer in rural Northumberland. Seventeen-year-old Silvie and her parents have joined an encampment run by an archaeology professor with an interest in the region's dark history of ritual sacrifice. As Silvie finds a glimpse of new freedoms with the professor's students, her relationship with her overbearing father begins to deteriorate, until the haunting rites of the past begin to bleed into the present.