A Puzzle of Old Bones (Slater & Norman Mystery #10)

An alternative cover edition for this ASIN can be found here

Newly promoted Detective Inspector Dave Slater could groan when he’s handed his first case in his new role. This isn’t the first time he’s had to deal with dug-up old bones – and things get even worse when he gets to the scene to discover the skeleton is that of a little boy.
Along with new partner DS Samantha Brearley, known as Watson, he tracks down a couple whose only son went missing years previously. But they are adamant that the remains found, and even a distinctive antique silver pendant discovered beside the body, can’t have anything to do with their missing son. When DNA results back up their assertion, Slater finds himself at a crossroads, the evidence pointing every which way.
But there’s an unfortunate fact about digging – once you start, you never know what else you might find. And Slater soon begins to realise, there could be more than the bones of a little boy lying buried deep in the past.