Cage And Current. Undertow Sins, #31

He built a marriage on lies. The ocean exposed the truth. Now, survival is the only currency left. Livia Renaud finds what is hidden for a living. As a forensic accountant, numbers are the only things she trusts-especially after a devastating phone call reveals her husband, Thane, drowned in a tragic shark cage accident off the coast of Kona. Unconvinced by the neat official narrative, she flies four thousand miles to dismantle the truth.
Her target: Kian Voss, the quiet, closed-off dive operator whose equipment failed. Kian lives in the shadows of his own past, carrying a heavy guilt the water refuses to wash away. When Livia steps onto his dock with cutting questions and an uncompromising gaze, he prepares to guard his secrets at all costs. He expects an angry widow looking for a scapegoat; he doesn't expect a woman who walks straight into the danger zone without flinching.
But before their war can truly begin, a brutal tropical storm forces them into open water. Shipwrecked and stranded together on an isolated, razor-sharp volcanic rock shelf, the rules of the mainland disappear. With tiger sharks patrolling the deep shallows and water rations running dangerously thin, the distance between the hunter and the suspect collapses to zero. To survive the heat and the predators, Livia must dive deep into Kian's world, only to discover that the cage latch didn't fail-it was deliberately released.
As the paper trail of her marriage morphs into a deadly corporate conspiracy stretching back to her own bloodline, the man she came to destroy becomes the only anchor keeping her alive. In the deep blue, some secrets are meant to be buried. Others surface with teeth.