Island of Bones — P.J. Parrish

ISLAND OF SECRETS
In the wake of a hurricane, a tiny bleached skull washes up in front of Detective Louis Kincaid's cottage. Days later, the bullet-ridden body of a woman surfaces on a nearby beach. She has no identification...except for a unique ring carved out of bone on her finger...

ISLAND OF TERROR
Sensing a connection between the dead woman and the skull he's found, Louis starts investigating. His search for the truth will lead him down a trail of hidden secrets and lies to face utter evil on a lonely island where treachery never dies and the living never escape...

ISLAND OF BONES