A Sunday Times top 10 hardback bestseller. Ancient secrets buried deep in Glastonburys past. & one womans quest to finally set them free. Cambridge present day: Following the death of her mother Abi Rutherford receives a mysterious bequest -- a misshapen sphere of crystal known as the Serpents Stone which seems to hold echoes of concealed mysteries long covered up by the church. Western England 25AD: A stranger has come to the chilly Somerset wetlands with a story of hope & reconciliation. But he is being followed by powerful forces determined that he will not undermine Roman rule in Britain. What connects these ancient events & Abis gift? & why do so many people seem desperate to hide the truth? A strange shadow has fallen across the centuries & a woman is in fear of her life. But is it danger that awaits her or the final truth so long whispered across the echoes of time?