When Dana Priest began researching a Washington Post series on national security following 9/11, she found a top-secret world that has become so enormous, so unwieldy, and so secretive that no one knows how much money it costs, how many people it employs, or exactly how many agencies duplicate work being done elsewhere. Award-winning reporter Priest, author of Top Secret America, will reveal how she investigated this shadow world and the enormous consequences of this invisible universe of over 1,300 government facilities, nearly 2,000 outside contractors, and more than 850,000 people granted “Top Secret” security clearance.