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Description from Goodreads: "Rose Justice is a young American ATA pilot, delivering planes and taxiing pilots for the RAF in the UK during the summer of 1944. A budding poet who feels most alive while flying, she discovers that not all battles are fought in the air. An unforgettable journey from innocence to experience, from the exhilaration of being the youngest pilot in the British air transport auxiliary, to the aftermath of surviving the notorious Ravensbruck women's concentration camp, Rose's story is one of courage in the face of adversity."
(Companion novel to 2014 summer reading option Code Name Verity. This novel can be read on its own.)
Check out Elizabeth Wein's website for tons of background on the Ravensbruck camp and the women held there.