There’s certainly a market for books that reveal narratives from the past, and historical fiction has long been a stalwart seller of the broader women’s fiction genre. But despite the dozens of titles published, few center black characters. In military-themed books, the lack of diversity is even more startling, as the stories of black women have gone largely untold — even among the countless tellings and retellings of white women as spies, as nurses, as the pining betrothed of men shipped off to battle.