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"
| Tagline | Moving stealthily in the background, always keeping their tracks well covered, the perpetrators of the terrible Black Secret conducted heir campaign with Michiavellian ingenuity. |
| Release Date: | Jan 02, 1919 |
| Genres: | Action, Adventure |
| Production Company: | George B. Seitz Productions |
| Production Countries: | United States of America |
| Casts: | Pearl White, Walter McGrail, George B. Seitz, Harry Semels, Wallace McCutcheon Jr., Henry G. Sell, Marjorie Milton, Francis Wightwick |
| Status: | Released |
| Budget: | $0 |
| Revenue: | 0 |
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