Many of us watched the terrorist attacks on September 11th, 2001 unfold right before our eyes. In the years since, law enforcement, congressional inquiries and the press have successfully uncovered more about what happened that day. But now on the 20th Anniversary of the attacks, many mysteries remain. Hosted by bestselling author and reporter Garrett Graff, Long Shadow answers those lingering questions and explores other enduring mysteries that still surround 9/11, the worst terrorist attack on U.S. soil. Premiering this August, produced by Long Lead and Goat Rodeo.