The eleventh Dr Ruth Galloway Mystery.
DCI Nelson has been receiving threatening letters telling him to 'go to the stone circle and rescue the innocent who is buried there'. He is shaken because although the letters are anonymous, they are somehow familiar - they read like the letters that first drew him into the case of The Crossing Places, and by extension, to Ruth. But the author of those letters is dead. Or are they?
Meanwhile Ruth is working on a dig in the Saltmarsh - another henge, known by the archaeologists as the stone circle. Soon after, bones are found on the site, and identified as those of Margaret Lacey, a twelve-year-old girl who disappeared thirty years ago. As the Margaret Lacey case progresses, more and more aspects of it begin to hark back to that first case of The Crossing Places, and to Scarlett Henderson, the girl Nelson couldn't save. The past is reaching out for Ruth and Nelson, and its grip is deadly.