Avon takes care of Omar's man Brandon but Wallace, who saw Brandon in the arcade, isn't too comfortable when he sees what they've done to him. Avon gives D'Angelo and Wallace a bonus for their good work. The police meanwhile get authorization to place taps for the pay phones used by D'Angelo and his crew but can only listen in when one of their suspects is using it meaning they'll have to keep the phones under constant observation. McNulty is in a tight spot when Major Rawls gives him a week to report back to his old job. When he realizes the connections McNulty's made in the various shootings, he announces he's going to arrest the Barksdales for murder and threatens to mess up the drug investigation.

While Greggs' life hangs in the balance, the entire department attempts to hunt down Savino. When Wallace flips, willing to testify that Stringer, Wee-Bey and Bird killed Brandon, Daniels stashes him in his grandmother's house on the outskirts of the city, but he soon becomes restless. Stringer tells Wee-Bey he needs to get out of Baltimore until the Savino investigation cools off, while Avon considers his next move. When McNulty and Pearlman try to pressure Levy into giving up Savino, he proves smarter than they gave him credit for. Meanwhile, when the detail's hand is forced, and a series of city-wide raids are ordered so as to appease Burrell's desire for "dope on the table," McNulty goes to see Phelan for help, but is surprised at his reaction. Daniels decides not to raid the main Barksdale stash house, but when word of his plan gets back to Burrell, he realizes there is a snitch in the detail. Elsewhere, Bubbles finds it increasingly difficult to stay clean.

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.

Omar continues his bold strikes on the heavily guarded Barksdale stash houses. McNulty launches his own investigation into last year's prison suicide of D'Angelo Barksdale. On the streets the bloodbath continues, prompting Burrell and Rawls to jack up the heat on their district commanders. The street violence also presents Daniels with a tough decision. A beleaguered Cutty tries to get his life back on track.

The brutality at police headquarters continues over the perceived failure of department commanders to rein in the city's crime stats. Another hit by Omar on the Barksdale stash houses goes horribly wrong. Proposition Joe summons Stringer Bell to a meeting and tells him that the cops have screwed up. Daniels reassigns his detail after the wire on Stringer Bell goes dead.

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.

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

Brother Mouzone returns to Baltimore on a mission of revenge and casts a wide net in his search for Omar. Colvin manages to put off a Sun reporter inquiring about Amsterdam. Pearlman and Daniels plead their case for a new kind of wiretap. Stringer Bell falls out of the loop with Avon Barksdale, while Marlo raises the stakes against the Barksdale gang.

Avon readies his troops for a seemingly endless war against Marlo. The detail works towards the top rungs of the Barksdale organization with the information garnered from the wire. While Royce continues to grapple with Amsterdam, Burrell offers a deal to minimize the fallout. Carcetti's political plans become obvious to his friend and fellow councilman Tony Gray. Bubbles offers his view of the world. McNulty changes tack.

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.

The ensuing negative attention turns Royce against Burrell, who takes the heat while Rawls comes to the rescue. At school, Prez's reward/punishment program meets with mixed results, and Colvin looks to restore order by separating disruptive "corner" kids from more attentive "stoop" ones. Chris tries to enlist Michael into Marlo's ranks, spooking Randy along the way. Dukie debunks Randy's "special dead" theory.

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.

With a bounty on him, Omar calls in a favor to Bunk. The election over, Royce and Carcetti make peace and contemplate their futures. At school, Prez tricks his students into learning math. Finally, Greggs uses 'soft eyes' at a crime scene.

To monitor the pulse on the street, Carcetti makes the rounds with members of the force. While Proposition Joe shows off his vocal range, Chris shows Snoop how to expose, and dispose of, New York infiltrators. Colvin uses "corner" logic in class. A newly sober McNulty attends an Irish cop wake - with a not-so-sober Bunk. Michael is dismayed by the unexpected return of a missing family member.

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.

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.

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.