Fatal Tide — Iris Johansen

Marine researcher Melis Nemid is treading dangerous waters--and she's about to be dragged under. Melis knows something that has already caused one oceanographer to disappear from the face of the earth ... and that's only part of a past torn by violence and betrayal. She thought she had put that past behind her when she arrived at her Caribbean island home to research dolphin behavior. But her peace--and her life--are about to be shattered by a savage killer who is cutting a path of destruction and death that leads directly to her. Whoever is after her knows her fears intimately. And soon she will be forced to relive them all over again. Except for the final nightmare--the one she can't possibly survive.