The immediate human toll of this 1994 disaster was staggering: all 132 people aboard died on a Pennsylvania hillside. The subsequent investigation was a maze of politics, bizarre theories, and shrouded answers. Bill Adair, an awardwinning journalist, was granted special access to the fiveyear inquiry by the National Transportation Safety Board (NTSB) while its investigators tried to determine if the worlds most widely used commercial jet, the Boeing 737, was really safe.