Hidden Order (Scot Harvath, #12)

A clandestine American organization, unaccountable to the public and masquerading as part of the government, holds immense power. Its control is now lost, jeopardizing the nation's future. When five potential leaders of this enigmatic agency vanish, counterterrorism operative Scot Harvath is dispatched to Washington to pursue the most perilous chase on American soil. As the candidates start turning up dead, the chase becomes a public spectacle, pointing to a centuries-old shadowy American cabal. With the United States on the brink of collapse, Harvath must unravel a conspiracy spanning centuries to avert the gravest threat America has ever faced.