The Janus Stone by Elly Griffiths

In The Janus Stone, the forensic archaeologist Ruth Galloway is called in to study a human skeleton found by some developers tearing down an old Victorian children's home in Norfolk, on the east coast of England. Like its prequel, The Crossing Places, there is an archaeological investigation into the past - this time, a Roman ruin instead of a Neolithic henge - as well as a Norfolk police investigation into a murder, led by Detective Inspector Nelson. Ruth and the gruff, happily married Nelson have a complicated relationship that is yet another subplot going on in the book. The British coastal setting is incredibly atmospheric, but it doesn't get in the way of the well plotted murder mystery.