Mystery rides the waves in this action-packed whodunit. Even before setting foot on the "Iris of the Seas" cruise ship, Hope Diamond knew she was facing trouble. She headed Diamond Security, a protection service for people at high risk, and she was on the cruise to protect her cousin's husband from an assassin. What she didn't know was that FBI Agent Matt Dennison would be on the ship. His mission was to prevent a traitor from turning over secret military microfilm to an enemy agent. She and Dennison had fallen in love, but she had decided to end their relationship. Now, rather than telling him when she returned home, she had to break the news aboard the ship. When a cyclone whips the ocean into a frenzy and two people are murdered, Diamond and Dennison must let go of personal feelings and join forces to prevent another killing and find the microfilm before the ship docks.