In 1938, the archaeologist Alexander Keiller - a millionaire playboy with a passion for ritual magic - plans to reconstruct the 5000-year-old stone circle at Avebury. As war looms, Frannie Robinson and her boyfriend, Davey, are among those who fall under his spell, with fatal results.
Seventy years later, Frannie's granddaughter, India, filming in the area, survives a helicopter crash. Devastated, she decides to move back to Avebury and her grandmother, setting out on a quest to discover the truth about her family. But why is her grandmother so reluctant to talk about Keiller and the war? And exactly whose past is India unearthing?