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Koenig has done what few historians have successfully achieved: she has made the process of research and analysis itself a compelling narrative. Mostly when historians go that route, it's because they're dealing with a murder or a like crime, in which case we can depend on readers wanting to follow the narrative of discovery the same as they might with a police procedural. (See e.g. the still-brilliant Return of Martin Guerre. Also, Ari Kelman manages it in his book on the Sand Creek massacre, because he's dealing with competing narratives about violent deaths much as a detective would deal with competing alibis.)