The world just keeps getting tougher and more complicated. America teeters on the edge of bankruptcy because of crushing foreign debt and an apparent savior, The Talos Corporation, delivers training for soldiers and security forces around the world, logistical support and badly-needed troops economically, but with a hidden cost that's both sinister and disturbing.
The three rookie FBI agents who survived the challenges portrayed in Quantico, have gone their separate ways but seem fated to be drawn back together in an alliance against a surprising challenge for which no one seems prepared. Rebecca Rose is brought back from an extended sabbatical when the President is shot and her second-in-command is implicated in an horrific crime - and all the threads point deeper into Talos's secretive activities. Fouad Al-Husam, working undercover inside Talos, has uncovered and been forced to hide vital information of a takeover plot that threatens America's independence.
Nathan Trace, victim of a violent incident in the Middle East, struggles with post-traumatic stress and seems to be recovering through participation in a treatment program, code-named Mariposa, which has unexpected side-effects that turn patients into brilliant, detached and sociopathic individuals - very smart and extremely deadly.
Only a desperate combination of misfits and survivors can combat an apparently inevitable collapse of American organization that will lead to the fall of democracy.