"The reason for most faked files is that the person they describe really was someone else once, and wants to remain hidden. Valerie tried to crack your file in the normal manner, but it proved a bit too stout. As a result, we started a massive search that compared facts in your file with the files of missing persons and wanted individuals—both public and private. We started with your Bertillon measurements—the measurements of the long bones and other skeletal features that do not change after adulthood—and factored in other data such as the estimated cost of creating a perfect cover. That left us with approximately a thousand missing women, any one of whom could have been you."