The burning room - Michael Connelly

In the LAPD's Open-Unsolved Unit, not many murder victims die a decade after the crime. So when mariachi musician Orlando Merced finally succumbs to complications from being shot ten years earlier, Bosch catches a case in which the body is still fresh, but any other evidence is virtually nonexistent. Partnered with rookie detective Lucia Soto, Bosch begins to see political dimensions to the case. Soto soon reveals a burning obsession that could make her a loose cannon, while the one piece of evidence they have on the Merced shooting points in a shocking and unexpected direction that could unsettle the very people who want Bosch to close out the case. It's looking like Orlando Merced may not be the investigation's only victim...