Dangerous Depths by Colleen Coble
Sometimes life's most precious treasure lies at Dangerous Depths.
Leia ditched a promising medical career to settle on a secluded island of Hawaii. She ditched Bane, too, and he's come to the island to find out why. He's also in search of a fortune rumored to lie offshore. But an act of sabotage that pushes Bane closer to Leia plunges them both into a tangle of emotion-just as a series of threatening events grip the island.
Theft, a friend's death, a bizarre intruder, hints of a second treasure . . . and even murder-how can they sort it all out when everyone on the island has something to hide?