Towards the end of World War II, survivors of a hospital ship hit by a torpedo cling to life aboard a crowded lifeboat. With no food, water or shelter, all seems lost - until a mysteriously silent German minesweeper comes menacingly towards them, giving them one last chance at survival. As the diverse crew explores the ship, it becomes all too clear that something diabolical has happened to the German crew. The mystery deepens even more when they meet a young Romanian girl, apparently the only survivor, who leads them to a locked room in the bowels of the ship.