"There's never been a paper bag." -- Colvin

Omar continues his bold strikes on Barksdale stash houses, now heavily guarded. Under orders from Stringer Bell, Bodie faces a critical test against Marlo, a fierce young dealer with lucrative corners. As the wire on Proposition Joe continues to yield little, McNulty launches his own reinvestigation of last year's prison suicide of D'Angelo Barksdale.

"Crawl, walk, and then run." -- Clay Davis

With Amsterdam running full-tilt, Carver and Truck discover there really is no honor among thieves. 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 but has overlooked the human toll, until the Deacon points out the deficiencies.

"I love the first day, man. Everybody all friendly an' shit." - Namond Brice

Prez is shocked by his students; Royce strikes back against Carcetti; Rawls begins to gut the major case unit from the inside; Colvin embarks on a new career.

"We got our thing, but it's just part of the big thing." - Zenobia

Prez wants to teach off curriculum. Carcetti visits the Homicide Department and goes on ride-a-longs for drug busts. Colvin and Dr. Parneti's class discuss the Corner Boy rules. Bunk convinces Holley to take another look at the Old Face Andre/Omar Little case. Herc and Dozerman begin shaking down Marlo and his crew as they try to have their surveillance camera returned. Chris Partlow and Snoop look to send the New York crew a message. Marlo asks Proposition Joe to look into Herc. Michael's father comes home, while Namond recruits a lieutenant.

"They don't teach it in law school." - Pearlman

After cooking up another scheme for the homeless case, McNulty and Lester become popular figures. Davis is set for his day in court by collecting the best legal assistance money can buy. Plus, Michael has brushes with the wrong side of the law, while Gus seeks help for an old story by going outside the Sun.