Tragedy strikes the Travis family. Tom tries keeping the family together. Grace convinces Jimmy he has a traitor in his organization. Mitch hesitates to help Grace. Jimmy discovers his money is missing. Max returns home. Jimmy and Grace make a deal.

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.

Jimmy Laszlo learns Grace's true identity. Alec takes revenge against a rival gang. Jimmy strikes a deal with Grace to find the traitor in his organization.

Grace has a police insider trace the money found in Charlie's safe; Alec learns that Max will be taking over Charlie's business; Tom seeks comfort with Shelley; a masked gunman ambushes Grace.

Grace learns about the missing money from Jimmy before investigating the abandoned shooting range; Grace sends Tom and Evie packing; Grace gets into Santa Rita with Mitch's help.

Grace confronts Elliot and Leni about her concerns for finding Sarah. Evidence is uncovered. Detective Lee becomes a liason. Elliot reveals to Leni the true nature of their investigation. Ethan, Ray and Spud find out about Cheat and take action.

Grace discovers Ethan hasn't been truthful about the night Cheat died. Leni reaches out to a Pentagon contact and discovers how Ethan and his team met. Detective Lee tails Ethan. Ethan and the team feel they're in danger. Billy and Evie grow closer.

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A firebombing drops the Laszlos between a vengeful Chinese gang and justice-seeking police. Grace finds a link between Jimmy's organization and the shooting outside Sam's school.

Grace thinks about going undercover whilst Elliot tells Leni aoff about her contact in the Pentagon. Spud and Ray find an unlikely new ally.

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

Grace is on a special FBI taskforce investigating a prostitution ring. Her home life is complicated by her mother, Vivian, who shows up after a prolonged absence. Tom has something to tell Grace. Ethan and team negotiate their first contract.

Grace is shocked when someone from her past, re-emerges. Leni's contact provides her with more information. Grace finds out about Billy's scrap. The force decide to plant a bug in order to spy on Ethan's team.

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.

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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.

Mitch warns Grace about confiding in Jimmy about her suspicions regarding Max. Max is aware of Grace's real identity and tells Alec. Grace and Mitch go to the parking lot where she was supposed to meet Michael Chen.

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

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 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.

Sam's death is linked to Jimmy's crew; Jimmy delivers a scolding to Alec; Capt. Campbell seeks dirt on Jimmy; Max receives word of the missing money.

Grace must face the verdict of the internal affairs review board. Jimmy believes one of his sons is dead. Grace tries to comfort Jimmy. Grace's fingerprints are discovered on a gun.

Spud looks for help from Ethan and Ray, and comes up with a plan to leave town. Grace shares her findings about Ethan with Leni and Elliot.