Secrets of a Charmed Life by Susan Meissner
Current day, Oxford, England. Young American scholar Kendra Van Zant interviews Isabel McFarland just when the elderly woman is ready to give up secrets about the war that she has kept for decades.
1940s, England. Fifteen-year-old Emmy and her sister Julia find refuge in a charming Cotswold cottage. As the Luftwaffe rains down its terrible destruction, the sisters are cruelly separated, and their lives are transformed.