In 1942, Anne’s sister Margot received a “call-up,” a summons to a German labor camp. That July, the Franks went into hiding in a secret apartment at 263 Prinsengracht , the same building where Otto Frank worked. Eventually four other Dutch Jews would join them in the “Secret Annex”: Fritz Pfeffer, and Hermann, Auguste and Peter van Pels. Anne began writing in a diary she had received for her 13th birthday roughly a month earlier. In one of her earliest diary entries, she wrote, “I hope that you will be a great support and comfort to me.”Indeed, the plaid-bound volume did become a source of solace to Anne during her adolescence. Her daily musings, reflecting on such common sources of teen angst as romantic crushes and sisterly squabbles, nevertheless showed introspection and literary acuity beyond her years.Memorable quotes from her diary express hope in the face of terrible adversity: “I hear the ever approaching thunder, which will destroy us too; I can feel the sufferings of millions; and yet, if I look up into the heavens, I think that it will all come right, that this cruelty will end, and that peace and tranquility will return again.”Non-Jewish friends and business associates of Otto Frank smuggled food to the residents of the Secret Annex. The group survived in secret for two years, until an anonymous Dutch informer tipped off the Gestapo , who raided the hiding place on Aug. 4, 1944.Anne and Margot were sent to the Bergen-Belsen concentration camp , where they both died of typhus in March 1945. Anne’s parents were sent to Auschwitz; the camp was liberated by Russian troops in early January 1945, just days after Anne’s mother had died.