Treachery Times Two by Robert McCaw

Secret military weapons, saboteurs, a volcanic eruption-and a probe of Chief Detective Koa Kane's criminal past
On Hawaii Island, a volcanic earthquake disrupts an abandoned cemetery-unearthing the body of a woman mutilated by her killer to conceal her identity.
The search for her identity leads Hilo Hawaii's Chief Detective Koa Kane to a mysterious defense contractor with a politically connected board of directors. Defying his chief of police, Koa pursues the killer, only to become entangled in an FBI espionage investigation of Deimos, a powerful secret military weapon. Is the FBI telling all it knows-or does it, too, have a duplicitous agenda?
At the same time, Koa-a cop who thirty years earlier killed his father's nemesis and covered up the murder-faces exposure by the dead man's grandson. Koa is forced to investigate his own homicide, and step by step, his cover-up unravels until another man is falsely accused.
Can Koa stand by and let an innocent man pay...