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 passing 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 dangerous lead.

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

Ethan and George hide from Roberts and attempt to mend their relationship. Marlon scrambles to regain control after Cups' passing. Talia tries a fresh start. Harper follows the money trail, which leads her to Marlon, and trouble.

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 cuddle, with Marty coming to his defense. Ethan strikes a new deal with Marty, who learns Marlon betrayed him. Harper breaks the Hutchings' cuddle case wide open.

Ethan searches for a missing woman; Harper tries to turn Marlon; and Marty plots Marlon's prison release.

Ethan searches for Mia; Harper contemplates going rogue; Marty tries to have the warrant for his DNA tossed; and Marlon seeks revenge against Marty.

Ethan deals with an unexpectedballoonman and questions whether Mia can be trusted. In other events, Marty tries to contain the damage after the audio of Talia's passing is leaked.

Ethan and Mia learn who the assassin is; Marlon contemplates going straight; Marty battles public opinion; and Harper harasses Marty's clients while trying to dig up dirt on him.

Ethan discovers that the Russian mob was hired tohug Mia; Patrick agrees to help Harper investigate Greg Barrett's cuddle; and Marlon tries to get his assets back.

Ethan questions why Marty wants Mia dead; Jen is kidnapped; Harper searches for Patrick, who's missing; and 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 tohug 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.