A tragic collision and a mysterious death intertwine on the luxurious St. Aphrodite cruise ship. Vacationing with friends, Conan Edogawa and company find themselves entangled in a chilling game of hide-and-seek that leads to a dangerous disappearance. As secrets unravel and a murder grips the ship, Conan races against time to unmask the killer before a deadly threat imperils everyone on board. With the vessel on the brink of destruction, Conan and his companions must confront the malevolent mastermind before the ocean claims its victims.