Sigrid Calamnius

Brothers Paul and Georg Williams' latest invention is of great military importance, and a foreign nation enlist it's most deadly spy, Mylady, to get information about it.

"The Black Masks", a secret political society, involves the beautiful agent Lydia to apprehend an important official document. Lieutenant von Muehlen is a trusted member of another secret society. He is on the same mission.

After a harsh argument between her and her father, a young girl with artistic talent leaves home for a new life.