In the back alley of a bar on Hawaii Island, a young man is found stabbed to death. When Hilo Chief Detective Koa Kane begins investigating the crime, the murder weapon is recovered only a few feet away from the body. Crime scene technicians find fingerprints on the knife --- they are a perfect match for Koa’s younger brother, Ikaika. As the brothers scramble to prove Ikaika’s innocence, another crime sends shockwaves through the Hilo police force. A sniper tries to take out Makanui, Koa’s closest colleague. As Koa tries to figure out if these crimes are linked, the sinister force continues their killing spree, threatening Koa and his loved ones at every turn. Could Koa be the real target? If so, who is behind this trail of retribution?

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 30 years earlier killed his father’s nemesis and covered up the murder --- faces exposure by the dead man’s grandson.

On Hawaii Island, an anonymous 911 caller reports a body at Pohakuloa, the Army’s live-fire training area. Hilo Chief Detective Koa Kane, a cop with his own secret criminal past, finds a mutilated corpse --- bearing all the hallmarks of ancient ritual sacrifice. He encounters a host of obstacles as he pursues the murderer --- an incompetent local medical examiner, hostility from both haoles (Westerners) and sovereignty advocates, and a myriad of lies. Koa races to discover whether the victim stumbled upon a gang of high-tech archaeological thieves, or learned a secret so shocking it cost him his life and put others in mortal danger.

Hilo, Hawaiʻi Chief Detective Koa Kāne learns that an elementary school was placed atop a volcanic vent, which has now exploded. The subsequent murders of the school’s contractor and architect only add urgency to his search for the truth. As Koa’s investigation heats up, his brother collapses in jail from a previously undiagnosed brain tumor. Using his connections, Koa devises a risky plan to win his brother’s freedom. As Koa gradually unravels the obscure connections between multiple suspects, he uncovers a 40-year-old conspiracy. When he is about to apprehend the perpetrators, his investigation suddenly becomes entwined with his brother’s future, forcing Koa to choose between justice for the victims and his brother’s freedom.

A scrap of cloth fluttering in the wind leads Hilo police Chief Detective Koa Kāne to the tortured remains of an unfortunate soul left to burn in the path of an advancing lava flow. For Koa, it’s the second gruesome homicide of the day, and he soon discovers the murders are linked. These grisly crimes on Hawaiʻi’s Big Island could rewrite history --- or cost Koa his career. The dead, a reclusive couple living off the grid, turn out to be mysterious fugitives. The CIA, the Chinese government and the Defense Intelligence Agency attempt to thwart Koa’s investigation and obscure the victims’ true identities. Undeterred by mounting political pressure, Koa pursues the truth only to find himself drawn into a web of international intrigue.