After a family tragedy, Kate Donnelly left the Caribbean behind. But now her family's diving and marine recovery business is drowning in red ink, so she heads back to the ocean that haunts her nightmares. Former British military diver Holden Cameron was addicted to the adrenaline rush of active duty. The last thing he wants is to babysit a family of thieves on a tropical island. But his new civilian job demands he investigate the suspicious activity surrounding a dive to recover treasure from an ancient wreck. When equipment, treasure, and divers begin to disappear, Kate and Holden form an uneasy alliance to uncover the truth. But the deeper they plummet into the mystery, the closer they come to each other.