Numerous books and articles repeated the tale of Bowser's espionage, often embellished and without any verifiable sources. The advent of the Internet made it especially easy for the story to circulate, and a growing interest in black history and women's history provided a steady audience for pieces about Bowser. Online pieces about Bowser could easily include an illustration—if one could be found.
As far as I can determine, the photograph began circulating in 2002, when Morning Edition ran a story about Bowser, and NPR included the photograph on their website, with a caption crediting it to "James A. Chambers, U.S. Army Deputy, Office of the Chief, Military Intelligence." A radio network might seem an unlikely venue for circulating a photograph, but NPR webpages are rife with images supporting each radio story, a fact that exemplifies the extent to which the Internet has made accessing and distributing visual content not only easy but seemingly necessary. (Try to find a popular, public-facing web page without any visuals.)
When my publisher, HarperCollins, asked for images to include in my novel, I dutifully sent the picture purportedly of Bowser. With photographs of Van Lew, Jefferson Davis, and other Civil War figures easy to find, it seemed only fair to feature a picture of Bowser herself. Cautiously, I captioned the image as "rumored to be of Mary Bowser." Ultimately, I couldn't resist the urge to show what Bowser looked like, even though elements of the photograph had always troubled me.
As historian and expert on internet hoaxes T. Mills Kelly warns, we should be skeptical about any Internet source that fills a gap in the historical record too neatly. What was the likelihood that a woman for whom we have no birth or death dates, who used several aliases throughout her life, and who lived during the earliest decades of photography, happened to leave a clearly documented studio portrait?
My doubts about the image grew when I unearthed several post-war sources corroborating Bowser's participation in the Richmond espionage ring. One of these documents indicates that in June of 1867, the slave-turned-spy, then using the surname Garvin, left the U.S. for the West Indies; after that date, she disappears from the historical record. But both the dress the figure in the photograph wears and the chair next to which she stands appear to be from a much later period. Could the only surviving portrait of Bowser really have been taken years, perhaps decades, after the woman herself otherwise seems to have vanished?
Diligence, doubt, and dumb luck—the great triumvirate of historical research—finally led me to an answer. In 2011, I'd contacted both NPR librarian Kee Malesky and the military office listed in NPR's original caption for the photograph, but neither could provide any information about the image. Despite this seeming dead end, I kept seeking the original, and in January of 2013, I mentioned the mysterious provenance of the photograph to Paul Grasmehr, reference coordinator at the Pritzker Military Library. He put me in touch with Lori S. Tagg, command historian for the Military Intelligence Hall of Fame, which inducted Bowser in 1995. Tagg searched their records and determined that "the Bowser photo most likely came from ... the Virginia State Library Pictures Collection."