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.

Harper is hit hard by Lobo's death; Ethan tells Marty the real reason he's in Chicago; Talia causes problems for Marlon; Grace and Ethan spy on Marty and the General; and Grace follows a dangerous lead.

Talia is arrested, which causes a headache 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.

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

Marty refuses to help Marlon, whose business is in jeopardy; Harper questions Patrick; Ethan decides what's next now that he's free; and Talia sets up Marlon.

Harper contains Patrick; Marlon is arrested for Talia's murder; Ethan makes a new deal with Marty, who learns that Marlon betrayed him; and Harper breaks the Hutchings' murder 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 unexpected gunman and questions whether Mia can be trusted. In other events, Marty tries to contain the damage after the audio of Talia's death 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 to kill Mia; Patrick agrees to help Harper investigate Greg Barrett's murder; and 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.

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.