Burrell reluctantly sides with Daniels in the disagreement with Rawls, giving the detail more time to make a case against Avon, despite his fears the operation is beginning to sprawl. McNulty and Pearlman present the detail's findings to Phelan, who signs an affidavit for a further thirty days of electronic surveillance. Using information from the wire on the pit pay-phones, the detail catch a runner on his way to the pit with a re-up. However, they elect not to arrest the driver, Anton 'Stinkum' Artis (Brandon Price), so as to avoid giving up their evidence in the charging documents. Stinkum's apparent free pass from the police convinces Avon and Stringer that their operation has been compromised, and Stringer introduces a new set of operating procedures. Rawls gives Det. Michael Santangelo (Michael Salconi) a choice; acquire information that he can use against McNulty or solve some of the department's open homicides, whilst the owner of Avon's strip club, Wendell 'Orlando' Blocker (Clayton LeBouef), has a proposal for D'Angelo. Meanwhile, Bubbles and Johnny attend an NA meeting, and Bubbles is moved by a speech given by recovering addict Walon (Steve Earle). Investigating the murder of the witness in D'Angelo's trial, with some help from Omar, the detail target Barksdale hitman Marquis 'Bird' Hilton (Fredro Starr).

Avon, Stringer and Wee-Bey discuss how best to deal with Omar after the attempted hit on Avon, deciding to let him think they want peace, whilst secretly planning to kill him. As such, Omar and Stringer meet for a parley, with security provided by Prop Joe. Meanwhile, Stringer insists on decreasing Avon's visibility in light of the detail's attempt to follow him after the basketball game. An irritable Phelan signs an affidavit for the new phone being used by the pit crew, and Pearlman tells McNulty that he is not up for automatic re-election, possibly because of the feathers he has ruffled due to his involvement with the Barksdale case. D'Angelo tries to understand why Shardene has left him, and after being clean for three days, Bubbles gets some advice from Waylon, before turning to Greggs for support. Meanwhile, McNulty attempts to flip Wallace, and the detail identifies Barksdale's main stash house. However, when Orlando's attempt to purchase weight gets him a lot more than he bargained for, Burrell sees an opportunity for a dangerous undercover operation.

Kima slowly recovers in the hospital. Stringer changes operations in the pit and the towers, rendering the wiretaps and clones useless, and prompting Burrell to begin dismantling the detail. Avon and Stringer meet Levy to discuss where their organization is vulnerable. Unbeknownst to the detail, Wallace returns to the pit to resume work. When Prez starts pulling political campaign finance reports, Pearlman is called to a meeting with a worried State's Attorney, and an angry Clay Davis confronts Daniels. Meanwhile, Stringer issues a difficult order to Bodie and Poot. With Shardene's help, the detail are able to install a camera in the strip club.

Lt Cedric Daniels lets it be known he is going to leave the department. McNulty pursues the identity of the Jane Doe found floating in the harbor. A pair of young longshoremen, Frank Sobotka's son Ziggy and nephew Nick, heist a container and sell its contents, digital cameras, to men working for The Greek.

The detail has a setback. Russell and Bunk revisit Philly, looking for evidence. Brother Mouzone talks with Stringer Bell regarding their agreement, leaving Bell to contend with Avon Barksdale. McNulty and Greggs return to the Westside, where they discover new connections. Herc and Carver feel disrespected by fellow officers. Nick tries to come to terms with the Greeks, and himself.

Greggs and McNulty recruit Bubbles to gather street intelligence on the Barksdale gang. Cutty seeks out the Barksdale gang after he loses his taste for the straight life. Bunk feels the pressure to find Dozerman's gun. Daniels worries that Avon Barksdale, having cut a prison deal, will be paroled. Stringer Bell tries to make amends with Donette.

Johnny pressures Bubbles to stop snitching for the detail. Cutty lies to his grandmother about going straight. McNulty realizes pursuing Barksdale and Bell is a losing cause, so he turns his attention to nailing Kintel Williamson. Colvin's free drug dealing zone, now known in the streets as Hamsterdam, scores a small victory. Avon Barksdale emerges from prison to a warm welcome from Stringer Bell.

Major Colvin instructs his men to use brute force to get the message out to street dealers about his free zone. Avon Barksdale and Stringer Bell discover that real estate development has its own pitfalls. McNulty and Greggs ask Daniels to let them renew the Bell and Barksdale investigation. On Barksdale's orders, Cutty plans to take back corners from Marlo's crew.

Prez impresses the detail with what he's found out from Bodie's cell phone, information that sends McNulty and Greggs on a road trip. Colvin sees the benefits of his plan working. Carcetti confronts a hurdle he must clear if he wants to run for higher office, while Marlo appears to take the bait set by the Barksdale crew.

Responding to an officer's call for help, McNulty and Prez turn up the wrong alley with unanticipated results. Cutty is surprised to find help from within Baltimore's power structure for his proposed boxing gym. Omar decides to go it alone against Avon Barksdale and Stringer Bell. Bubbles is wired up and sent into Hamsterdam

Herc's soft-duty job with the mayor takes an unexpectedly hard turn. Despite the potential damage to her career, Pearlman provides Freamon and Sydnor with subpoena ammunition for their 'grizzly bear' hunt in City Hall.

With Election Day approaching, the three mayoral candidates make last-minute appeals. Carcetti wrangles for votes as he responds to a potentially devastating smear. Norris and Greggs get a lead on the Braddock case, but end up being detoured.

Acting on Clay Davis' advice, Burrell seeks to burnish his reputation by ordering the department to double their street arrests. The mandate does not sit well with McNulty, who sets his sights instead on cracking a string of church robberies.

After flexing his muscles around the city, Carcetti faces his first dilemma when a group of ministers protests Herc's mistreatment of one of their own. Randy gets the cold shoulder at school. Omar and Reynaldo pay a menacing visit to Proposition Joe, with their own proposition. Freamon has a revelation at a crime scene that promises to blow the lid off an unsolved mystery.

In the Season Four finale, the bodies from the vacants pile up while Burrell offers his support to Daniels and admonishes Rawls for crossing him. A distraught Bubbles finds himself at his wit's end after his revenge plan backfires.

Season Five premiere. As McNulty and the detail continue staking out Marlo's crew, recently promoted Sergeant Carver is welcomed by a cauldron of discontent from officers coping with unpaid overtime.

Although he tells Sydnor the Davis investigation could be a 'career case,' Freamon keeps a wary eye out for Marlo, who takes care of some unfinished business and strikes a business deal with Barksdale.

Carcetti's master plan for the police department is leaked to the press, sending the brass into a panic. Marlo turns to Proposition Joe to help with an enviable problem. Whiting and Klebanow drop a bombshell on the newspaper staff.

Campbell tries to smooth out the transitions in the police department. The newspaper scrambles to confirm surprising news from City Hall, but lose out to the TV media in scooping a high-profile Grand Jury appearance.

Marlo forges an alliance with a drug connect, who shows him a new communications trick. McNulty's case gets increased attention from the newspaper, in large part thanks to the addition of Templeton to the reporting team.

Mystified by Omar's disappearance, Marlo and Chris ramp up their efforts to locate their nemesis. After a sparsely attended waterfront ceremony, Carcetti fires away at a larger press event--and recasts himself as a champion for the homeless.

An unexpected call puts Templeton back in the spotlight--and gets McNulty more attention than he expected. Bunk bucks at Landsman when ordered to help with the force's most recent red ball.

Baltimore's renewed police commitment brings fresh recruits to Daniels and McNulty, starting with Carver. Facing a new political challenge, Carcetti is forced to make dangerous political deals.

With Steintorf ordering Rawls to initiate 'creative' remedies for the rising crime rate, Freamon's vigilance pays off with a promising lead, sending Sydnor and the department into overdrive.

Carcetti maps out a damage-control scenario with the police brass in the wake of a startling revelation from Pearlman and Daniels. Their choice: clean up the mess...or hide the dirt.

An unexpected call puts Templeton back in the spotlight--and gets McNulty more attention than he expected. Bunk bucks at Landsman when ordered to help with the force's most recent red ball.

Marlo forges an alliance with a drug connect, who shows him a new communications trick. McNulty's case gets increased attention from the newspaper, in large part thanks to the addition of Templeton to the reporting team.

Herc's soft-duty job with the mayor takes an unexpectedly hard turn. Despite the potential damage to her career, Pearlman provides Freamon and Sydnor with subpoena ammunition for their 'grizzly bear' hunt in City Hall.

With Steintorf ordering Rawls to initiate 'creative' remedies for the rising crime rate, Freamon's vigilance pays off with a promising lead, sending Sydnor and the department into overdrive.

Baltimore's renewed police commitment brings fresh recruits to Daniels and McNulty, starting with Carver. Facing a new political challenge, Carcetti is forced to make dangerous political deals.

Campbell tries to smooth out the transitions in the police department. The newspaper scrambles to confirm surprising news from City Hall, but lose out to the TV media in scooping a high-profile Grand Jury appearance.