Simona Bell, the lovely daughter of Lord Belgrave, has been invited by her friend, Karoline von Honentaal to stay with her family in Berlin. Simona finds that Karoline?s father, the baron, owns an amazing collection of art. Alone for a moment, she finds her way into the Baron?s private sanctuary, where she admires an unusual sedan chair. Hearing voices and frightened she might be discovered, she slips into the chair and closes the door. The baron and another man enter the room and Simona overhears them discussing an Englishman called Watson, who has been working on a new naval gun with the Marquis of Midhurst. Watson has been kidnapped by the Germans, who are desperate to learn the secrets of the gun.