Vacations Can Be Murder by Connie Shelton (A Charlie Parker Mystery Series, Book 2) from Books In Motion.com

Charlie's last case left her tired and emotionally drained, so her office staff convinces her to vacation in Kauai. Charlie is riding in a helicopter when she and the pilot spot a dead body lying on the rugged rocks of Kauai's NaPali coast. Mack Garvey, the owner of the helicopter tour company, is accused of the murder. Charlie wants to avoid the whole mess but is persuaded to help Garvey prove his innocence. As the tension builds, Charlie roots out the suspects one by one never dreaming that her own life is about to be snuffed out by sinister means.