McNulty (Dominic West) is assigned to a team of outcasts assigned to probe drug lord Avon Barksdale's (Wood Harris) operations.
A witness who testified against D'Angelo is found murdered; Greggs is briefed on the Barksdale probe.
Detectives' inquiries spark a minor riot, causing a boy to lose an eye and giving police a black eye publicity-wise.
Stringer Bell gets an education in construction management; Bunk delivers a searing message to Omar; Daniels keeps up the front of marriage to Marla.
McNulty and Daniels try to figure out what to do with Wallace; Sydnor and Carver track down one of Barksdale's stash houses.