Laura and Owen buy a secluded cottage on the edge of the Peak District. Old mines riddle the hills surrounding their new home and soon after moving in, Laura starts to hear faint snatches of birdsong. Her husband, wrapped up in his new job, is rarely around. Nervous and alone, Laura fears she's developing tinnitus. Her doctor can find nothing wrong. Then an archaeological dig on a neighbouring hill unearths some disturbing finds… and Laura's life starts to become terrifying.