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.
Gang members arrested in the raid face arraignment; Greggs and McNulty try to turn Hardcase into an informant.
Detectives' inquiries spark a minor riot, causing a boy to lose an eye and giving police a black eye publicity-wise.
A tip-off prompts arrest, but Avon and Stringer grow suspicious; another witness to the Grant murder emerges.