Dr. Peter Chesterfield is the top neurosurgeon at the Royal London Hospital. He's also a workaholic, and after a blow-up with a colleague, his boss orders him to attend a medical symposium at the luxurious Elysium Grand on the island of Maui. During a midnight walk on the beach, Peter pulls a woman with a skull fracture from the water. Despite all his skill, she dies in his arms, leaving him with only one clue to what happened to her: the word "honu." Obsessed with finding the cause of his patient's death—discovering what or who ripped the power over life and death from his surgeon hands—Peter becomes entangled in an ongoing investigation. He also becomes a source of deep irritation to detective Lisa Kealoha, who has jurisdiction over the case. The reluctant pair join forces, diving deep into Maui's evolving gang culture, and unearth a conspiracy that runs deeper than either could have imagined. Knowing too much is deadly—and they must catch the killer before the killer catches them.