Shadows and Sins - The Falconer Files Murder Mysteries, #13

The thirteenth in the best-selling Falconer Files by Andrea Frazer.  The body of a woman has been discovered in Castle Farthing Woods, and it appears that although she had been dead for years, nobody had ever reported her missing. DI Harry Falconer of the Market Darley police is perplexed - and not only in his working life. He has recently resumed his relationship with psychologist Dr Honey Dubois - but while visiting a local village in the course of his investigations, unsettling memories of a former love are revived.
Then the bodies start to come thick and fast ... As Falconer's sidekick DS Carmichael is coping with the early birth of his twins, the DI is forced to form a closer bond with his new constable, as they try to solve a nightmare conundrum. For Falconer is forced to confront the fact that someone has been committing these murders under the radar and under his very nose: he is forced to acknowledge that, in the midst of beautiful countryside and quaint market towns, there is a serial killer on the loose.