Recently retired teacher Hilary decides that the best way to stop herself worrying about her husband, who's away doing voluntary work in war-torn Gaza, is to distract herself with a holiday. She invites her good friend Veronica, a recent widow, to accompany her on a trip to Glastonbury, to see the ancient sights. The pair are saddened to discover that the sacred Glastonbury Thorn tree has been severely damaged, and they wonder whether other local sites are under threat too. But even they are unprepared for the shocking discovery Hilary makes at the Chalice Well: an abandoned bag, containing a bomb ... Who is to blame? A foreign tourist? An eccentric pagan author? Or an angry local who resents that a Christian place has been 'overun' by other beliefs? Hilary and Veronica just want to be on holiday, but they can't help but be sucked in to the investigation.