Grace is still missing. Ethan heads to Chicago to investigate notorious attorney Marty Stein. DEA agent Harper Deakins' investigation into one of Chicago's deadliest gangs takes a turn when a routine stakeout goes wrong.

Grace works to escape. Ethan reconnects with his father. Escalating gang warfare spills into the suburbs. Ethan investigates Marty's leak at a party, where he meets Marlon Dinard, who is not what he seems.

Grace heads to Chicago to work with Ethan. Marlon appears on Harper's DEA radar. Harper's CI, Lobo, is made. Ethan finds Marty's leak.

Lobo's death hits Harper hard. Ethan confesses to Marty why he's really in Chicago. Talia causes problems for Marlon. Grace and Ethan spy on Marty and the General, hoping for leverage. Grace follows a lead which has a deadly outcome.

Talia is arrested, which causes a problem for Marty; Harper uncovers another clue in Hutchings' death; and Ethan searches for Grace and tries to rescue his father before it's too late; Marty's double agent is revealed.

Ethan and George work on their relationship while hiding from Roberts; Marlon strives to regain control following Cups' death; Talia tries a fresh start; and Harper follows the money trail, which leads her to Marlon.

Patrick investigates who shot at Harper, while she tries to trap Marlon. When this fails, she tries to flip Talia. Ethan turns himself in, but has an exit strategy in play. Harper's relationship comes undone.

Ethan rots in prison. Roberts is arrested. Marty and the General have a sparring match over dinner. Harper leaves Jack and stays with Patrick, leading her to a few revelations. Talia plans her next move after a fight with Marlon.

Marlon's business is in jeopardy and Marty refuses to help. Harper questions Patrick. A free man, Ethan needs to decide what's next. Talia sets up Marlon. Marty learns of the sting and rushes to stop Marlon before it's too late.

Harper keeps Patrick contained. Marlon is arrested for Talia's murder, with Marty coming to his defense. Ethan strikes a new deal with Marty, who learns Marlon betrayed him. Harper breaks the Hutchings' murder case wide open.

Ethan looks for a missing woman, but soon realizes she's in hiding from someone who's trying to kill her. Harper tries using the recording of Talia's death to turn Marlon. Marty plots Marlon's prison release.

Ethan continues to look for Mia. Constantly outsmarted by Marty in her investigation, Harper contemplates going rogue. Marty works to get the warrant for his DNA thrown out. Marlon seeks revenge against Marty.

Ethan contemplates if he can trust Mia while dealing with an unexpected gunman. Marty does damage control after the audio tape of Talia�۪s death is released. Harper tries to hide her involvement in leaking the tape.

Ethan and Mia learn the identity of the assassin. Marlon considers starting over and forgoing illegal activity. Marty fights the court of public opinion regarding Talia's death. Harper harasses Marty's clients for dirt on him.

Ethan learns the Russian mob was contracted to kill Mia. He works to discover who ordered the hit. Harper convinces Patrick to help her secretly investigate Greg Barrett's murder. Marlon tries to get his assets back.

Ethan queries why Marty wants Mia dead, but the investigation is halted when Jen is kidnapped. Harper looks for a missing Patrick. Marlon lies to Zipporah while continuing to help Ethan.

Harper and Lowry interrogate Russian mobsters hoping to find Mia, but find clues about Patrick instead. Ethan and Jen conduct their own investigation into Mia's kidnapping. Marlon attempts to hide his bullet wound from Zipporah.

Ethan discovers Tilda's plan to kill him, but gets the upper hand, interrogates her, and learns the truth. Marty forces a captured Mia to use the flash drive. Harper deals with the aftermath of the task force being shot up.

Ethan, Marty, and Mia scramble to get enough money to keep the Russian mob off their back. Harper and Patrick's investigation leads them to Tilda's dead body and Marty. Marlon fights for his relationship with Zipporah.

Harper finds out Mia's true identity and tries to leverage this to make her turn on Marty. Ethan must decide if he trusts Mia or Marty while the three pull a heist together. Marlon turns back to his old gang lifestyle.