More determined than ever to focus on their hard-earned relationship, Vincent and Catherine attempt to celebrate their marriage with a romantic getaway, far from the city and the stresses of work, family, and anything else that could keep them apart. No cell phones, no guns, no beasting out—just each other. But when their tranquil cruise ship is transformed into a crime scene, there's no escape, and Cat and Vincent are submerged in chaos. Can they bring down the threat before it brings down the ship?