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.

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 is jailed after being arrested for murder; Mitch and Wilson discover they share common interests; Tom is among the witnesses questioned by Hernandez and Campbell; Alec meets with Jimmy's crew.

Ethan helps Clea with her case before double-crossing her. Patrick catches up with Sadie. Clea figures out the identity of the mystery man killed at the warehouse. Ethan, Mia and Marty join forces for one final deal.

Ethan goes into hiding after the bombing of the Federal building. The bookseller holds Clea captive. Theresa scrambles to tie up loose ends in her hunt for Ethan. Regan agrees to assist Ethan and Clea, but it's a step too far.

Ethan tracks down Clea while getting dragged deeper into the world of Casey Oaks. Clea investigates Oaks' possible involvement in Maria's murder. Mia reconnects with an old accomplice. Patrick struggles to come to terms with Harper's death.

Ethan and Clea work together to discover who's behind the conspiracy. Ethan forces Theresa to reveal her hand. Clea follows a seemingly innocent bookseller. Ethan does Theresa's bidding to unexpected ends.

Ethan returns to San Francisco hoping for a fresh start. But when Ray's brother asks for help, Ethan gets involved. Mia needs Marty's help to get her off a murder charge. Clea catches a businessman's murder that takes her down a rabbit hole.

Ethan and Clea discover what happened to Regan. They race to find the accountant before he's taken out. As authorities close in on Ethan, he and Clea work to uncover a greater conspiracy.

Ethan turns on Clea and Regan. Devastated by Phan's disappearance, Clea searches for clues. Patrick and Ethan investigate the hit-and-run in search for Mia's accomplices. Mia and Sadie are forced on the run.

Ethan has to navigate a dirty cop. Having escaped from federal custody, Mia's on the hunt for Ethan. Meanwhile, Patrick's on Mia's trail. Clea investigates Maria's murder.

Ethan robs Oaks and faces the consequences. Mia and Sadie fight over how far they'll go for money. Clea tries to protect one of the young trafficked girls. Patrick finally catches up with Ethan.

Ethan reveals to Grace they borrowed money from the wrong men. Ray realizes something is wrong with Spud. Ethan, suspicious, digs into Grace's background. Grace tries to help Billy but it backfires. Spud and Ray have a heart-to-heart talk.

Ethan and Ray are forced to figure out what to do about Spud. Leni and Grace speculate about the money Ethan has given away. Ethan tracks Grace. Billy tries to win Evie back. Evie confronts Grace. Grace finds a new clue in the search for Sarah.

A surprise discovery is made by Leni and Grace in Vancouver. The truth about Cheat's death is also revealed.

Ethan and Ray fall out. Grace says sorry to Evie. Leni and Grace find out the original source of Ethan's money. Sarah and Grace work together to track Ethan and Ray.

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

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.

Ethan scrambles to raise money to pay off Mia. Mia targets Ray's kids and convinces Sadie to help. Clea searches for the trafficked girls. Patrick surveils Ethan in the hopes of catching Mia.

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

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 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.