The Mysterious Lady (1928) is a Metro-Goldwyn-Mayer silent film romantic drama, starring Greta Garbo, Conrad Nagel, and Gustav von Seyffertitz, directed by Fred Niblo, and vaguely based on the novel War in the Dark by Ludwig Wolff.

[4] In Vienna, Captain Karl von Raden (Conrad Nagel) purchases a returned ticket to a sold-out opera and finds himself sharing a loge with a lovely woman (Greta Garbo).

She is being escorted by General Boris Alexandroff (Gustav von Seyffertitz), the infatuated head of the Russian Military Intelligence Department.

While Alexandroff and Tania are alone in his home office, he receives a parcel containing the latest secrets stolen by the traitor, whom he casually identifies as Max Heinrich.

Warner Home Video released The Mysterious Lady to DVD in 2005 as part of a box set called The Garbo Silents Collection with a music score by Vivek Maddala.