Firehouse 51 responded to a horrific warehouse fire that killed 39 people. This led the Chicago P.D. on a manhunt for the suspect. Now with someone in custody for both arson and multiple murders, it is up to Peter Stone and his team, including lead investigator Antonio Dawson to step in to bring some peace and resolution to so many families and friends of those lost - including one very close to home. When the team comes face to face with a hotshot attorney, they find themselves up against a dicey confession, incriminating evidence, and a questionable motive.

When a Muslim grad student is brutally murdered, Stone and the team arrest his friend, another Muslim student, who claims he committed murder to prevent a terrorist attack. The jury must decide whether he's a killer or a hero.