Helena P. Schrader is an established aviation author and expert on the Second World War. She earned a PhD in History from the University of Hamburg with a ground-breaking dissertation on a leading member of the German Resistance to Hitler, which received widespread praise on publication in Germany. Her non-fiction publications include Sisters in Arms: The Women who Flew in WWII, The Blockade Breakers: The Berlin Airlift, and Codename Valkyrie: General Friedrich Olbricht and the Plot against Hitler, an English-language adaptation of her dissertation. She has also published a number of historical novels and earned over twenty literary awards.