Jane Sperling is the great grandmother of Atticus Rosenbloom and Jake Rosenbloom . She was a medieval scholar. She worked for the War Department as a secretary and was part of the French Resistance. She married a GI in Maine, United States. She was Jewish. She was taught by a Nazi, Professor Otto Hummel. She swapped the de Virga which now is in the hands of Vesper One. She also flew Grace Cahill into Austria when Grace had to protect the Ghent altarpiece. She appears to be an expert aviator. She was known to the US army as "The Sparrow" and killed Otto Hummel .