The Stone Circle (Ruth Galloway, Bk. 11)

Nelson has been receiving anonymous letters and their resemblance to those that marked his first case with forensic archaeologist Ruth Galloway has left him uneasy. After all, the author of those letters is dead. Or are they?

Then he gets a call from Ruth. She is digging on the Norfolk Saltmarsh, on the site of a henge - a stone circle. And she has found the bones of a young girl. When the body is identified as that of Margaret Lacey, a twelve-year-old who went missing thirty years ago, the police reopen the cold case.

Are the letters a coincidence, or did someone really know all along where Margaret could be found? What else might they know, if only Ruth and Nelson can find them?