Highly-decorated war hero Bob Lee Swagger is recruited by his former Commander to prevent an assassination of the President. Meanwhile, FBI agent Nadine Memphis investigates potential assassins.

Bob Lee struggles to protect his family from behind bars while Isaac attempts to silence him. Nadine reaches out to Bob Lee’s wife, Julie, who deals with the backlash against her family.

Bob Lee reaches out to Nadine as he evades his pursuers, putting her on to the cop who took credit for his capture. Isaac juggles his double life as he tries to find Bob Lee.

In a flashback to their time serving in Afghanistan, Bob Lee and Isaac clash with opposing ideologies. Nadine investigates the Ukrainian connection, putting herself on the conspirators' radar.

Bob Lee finds the bullet from the assassination, leading him to a radical militia group and a reckoning with Isaac while Nadine is locked in a deadly game of cat and mouse with Payne.

Bob Lee tracks down his former instructor Rathford O’Brien to help him find the shooter. Nadine interrogates Payne and a reporter approaches Julie with a deal.