The Black Secret (1919)

Adventures of an American Secret Service-girl in search of an important German secret during the war. Chapters: [1] “The Great Secret,”; [2] “Marked for Death,”; [3] “The Gas Chamber,”; [4] “Below the Waterline,”; [5] “The Acid Bath,”; [6] “The Unknown,”; [7] “The Betrayal,”; [8] “A Crippled Hand,”; [9] “Woes of Deceit,”; [10] “The Inn of Dread,”; [11] “The Death Studio,”; [12] “The Chance Trail,"; [13] “Wings of Mystery,”; [14] “The Hidden Way,”; [15] “The Secret Host"

Released Jan. 2, 1919 310 min None+

Genres: Action, Adventure

Keywords: tmdb.gun, tmdb.lost-film, tmdb.movie-serial, imdb.serial, imdb.switzerland, imdb.carrier-pigeon, imdb.woman-walks-alone-in-the-woods + 12 more, imdb.leather-coat, imdb.german-soldier, imdb.pilot, imdb.world-war-one, imdb.german-spy, imdb.secret-message, imdb.unconscious-man, imdb.aviatrix, imdb.gun, imdb.soldier, imdb.lost-film, aspectratio.1-33-1