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Dear Reader Once and its sequel Then are two parts of the same story, but they were written and published as two separate books. In this edition they are together for the first time. Felix and Zeldaβs story came from my imagination, but it was inspired by a period of history that was all too real. My grandfather was a Jew from Krakow in Poland. He left there long before that time, but his extended family didnβt and most of them perished. Fifteen years ago I read a book about Janusz Korczak, a Polish Jewish doctor and childrenβs author who devoted his life to caring for young people. Over many years he helped run an orphanage for two hundred Jewish children. In 1942, when the Nazis murdered these orphans, Janusz Korczak was offered his freedom but chose to die
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