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The Diary of Anne Frank is one of the most widely read first-person accounts of the Holocaust. The question of how Anne and her family were discovered has haunted readers for decades. In a new book, The Betrayal of Anne Frank: A Cold Case Investigation, author Rosemary Sullivan details what an investigative team found when they set out to answer: who tipped off the authorities to Anne’s hiding spot?

Turns out, it’s more complicated than you’d think. Marsha Lederman, the Globe’s Western Arts Correspondent, interviewed Sullivan about her book, and explains what they found, and what we can learn from this story today.