Broken Ground by Val McDermid

It's supposed to be her inheritance and it's looking good when they dig the first motorcycle out.  The second motorcycle has an attachment, though.  There's a dead body on it...

Atlantic Monthly Press and Net Galley allowed me to read this book for review (thank you).  It will be published on the 5th.

Since the body has been there for twenty-five years or more, the coroner calls DCI Pirie to investigate.  Her boss is not happy about that; she's the one that gives orders, not coroners.  

As she works on the case, she gives a new man in her office work on another case.  He hates it but then he finds the DNA matches and he's probably found the killer.  When the suspect is brought to the police station to be questioned, he gets killed on the entry way by a grieving father, who should have known nothing about it.  The new man, who was a spy and a pain, is disciplined and removed from her department because he told the father about it.

They keep digging, looking for the killer from long ago.  When they find the murderer, new trouble develops.  Will DCI Pirie be able to solve her case?