three days later, thejewish teenager was arrested. this was the frank family's hiding place during the nazi occupation of the netherlands. and this question of who betrayed the frank family, who had lived in this building undetected for more than two years, untiljust months before the end of the war, has remained one of the great mysteries of dutch history. and now this team of investigators have identified a man they believe is the key suspect, ajewish lawyer who had been based here in amsterdam helping jewish refugees fleeing nazi germany. no dna clues or video images existed, so the detectives relied on circumstantial evidence, and a note. the final suspect became the person who was named in an anonymous note sent to otto frank shortly