On what was meant to be a peaceful family cruise from New York to New Orleans, retired homicide investigator Jason Barns finds himself trapped in a nightmare. The infamous "Cardiac Killer"-the murderer who haunted Jason's career-has resurfaced, turning the luxury liner into a floating slaughterhouse. Victims are paralyzed, their hearts carved out while still alive, and Jason's family is pulled into the crossfire. With panic rising, bodies mounting, and the killer taunting him at every turn, Jason faces the ultimate choice: capture the monster he's hunted for decades-or fulfill his daughter's dying wish and kill him.