The Crossing Places:  A Ruth Galloway Mystery by Elly Griffiths

Sequestered in a tiny cottage on the edge of a remote English Saltmarsh, Ruth Galloway’s humdrum life as a professor of archaeology at the University of North Norfolk is about to take an exciting turn. She is jolted from her solitude by the discovery of a set of bones not far from her isolated home. As a forensic archaeologist, she is asked to examine them by Detective Chief Inspector Harry Nelson. It turns out that the body is two thousand years old from the Iron Age! Inspector Nelson is disappointed by this discovery since he was searching for the remains of Lucy Downey, a young girl who had disappeared ten years ago whose body had never been found.