Using new technology, recently discovered documents and sophisticated investigative techniques, an international team–led by an obsessed former FBI agent–has finally solved the mystery that has haunted generations since World War II: Who betrayed Anne Frank and her family? And why?

Over thirty million people have read The Diary of a Young Girl, the journal teen-aged Anne Frank kept while living in an attic with her family in Amsterdam during World War II, until the Nazis arrested them and sent Anne to her death in a concentration camp. But despite the many works–journalism, books, plays and novels–devoted to Anne’s story, none has ever conclusively explained how the Franks and four other people managed to live in hiding undetected for over two years–and who or what finally brought the Nazis to their door.

With painstaking care, former FBI agent Vincent Pankoke and a team of indefatigable investigators pored over tens of thousands of pages of documents–some never-before-seen–and interviewed scores of descendants of people involved, both Nazi sympathizers and resisters, familiar with the Franks. Utilizing methods developed by the FBI, the Cold Case Team painstakingly pieced together the months leading to the Franks’ arrest–and came to a shocking conclusion.