The Janus Stone by Elly Griffiths (2011)

Ruth Galloway is like a cross between Mo Hader's Flea Marley and Kathy Reichs' Temperance Brennan.  This is the second of Griffiths' mysteries with Forensic Anthropologist Ruth Galloway.   The first is The Crossing Places (2010). The next is to be The House at Sea's End.

The plot begins when the headless skeleton of a young child is found buried under the door sill of an old mansion that is being torn down.  The intricate plotting keeps you guessing until the end, while Ruth is put into danger, and two different men are determined to save her.  Ruth reminds me of Flea Marley (Mo Hader) in her outlook on life.  Of course, Marley is also English.  The book is set in and around Norwich, England.