Lt. Daniels puts his team together but the extra help he's asked includes several less than stellar officers. It also includes McNulty, who is obviously in the doghouse. When one of the witnesses against D'Angelo Barksdale is found dead, McNulty and his homicide partner 'Bunk' Moreland bring him in for questioning. They have no evidence that he had anything to do with the killing but their instincts tell them otherwise. When news of the witnesses death hits the press, Major Rawls is convinced that McNulty is again responsible. Three of the newly assigned detectives, Hec, Prez and Carver decide to go to the towers and flex a little muscle only to have it turn into a major disaster.

Avon Barksdale is becoming paranoid and thinks he's being watched. He's also worried his phone is being tapped. He also thinks there's a snitch in D'Angelo's crew and he's told not to pay anyone until it's sorted. D'Angelo isn't too pleased when he hears Avon has given Stinkum a new territory. Judge Phelan visits the squad to sign the warrants to clone D'Angelo Barksdale's pager. The numbers they're collecting are coded and don't make much sense. Det. Prez Pryzbylewski figures it out however. McNulty and Greggs try to get information from Omar.

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.

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.

Weak product in the pit has Bodie getting heat. Homicide detectives hand out grand jury summonses to stevedores involved in the homicide case, and Port Police Officer Beadie Russell works the lingering affections of an old boyfriend to find out how cargo disappears from the docks.

Greggs and Prez tap into the circuit of Russian prostitutes. With two sets of evidence, the detail goes to Pearlman who tells them neither crime merits a wiretap, but a drug connection could give the case legs. Rawls can't persuade Daniels to take the murders, but new evidence does. Though discord grows in Barksdale's empire, Bell tries to hold it together.

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.

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.

Daniels goes ballistic when the detail gets reassigned to the Western District. Stringer Bell learns from Donette that Brianna is thinking about talking to McNulty. Bunk receives a gift wrapped surprise. A single cell phone allows Freamon to begin mapping out a communications network for the Barksdale organization. Marlo dispatches a drive-by on a Barksdale drug corner.

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.