April, 1912. Evil German financier Gunther Voss has a plan to bring the U.S. into what will be a devastating war against Britain. It falls to the unlikely collaboration between Alex Tremayne of Britain's Secret Service Bureau and a pioneering female agent, Maria Weston with the U.S.'s Bureau of Investigation, to stop him and his cohorts, who are about to put the final pieces of their plot together as they cross the Atlantic in style. Little do they know that the maiden voyage of the largest passenger steamship in the world will be its first and last.