A late-night ferry ride across New York Harbor turns deadly when a seemingly harmless mouse mutates into a violent, murderous creature. The deckhands, crew members, and a motley mix of passengers-including a bachelorette party, an EMT, and a reluctant commuter-suddenly find themselves trapped aboard with no communication, failing power systems, and a feral predator stalking the hallways. As panic mounts, alliances form and break while the survivors try to piece together how the creature came to be and how to stop it. They navigate dark corridors, hidden shafts, and sabotaged systems, all while being hunted. In the end, only a few manage to confront the beast, and though they believe theyve defeated it, the final moments hint that the threat may not be fully over.