Bunk and Freamon chase a container ship to Philadelphia; Lt. Cedric Daniels is unhappy with his assignment; McNulty pursues the identity of his Jane Doe.
Omar continues to make bold strikes on Barksdale stash houses; McNulty launches an investigation into a prison suicide.
Colvin arms himself with intelligence from Daniels' detail; Carcetti wants to fix the witness protection program; Omar struggles with dissension in the ranks.
Stringer Bell gets an education in construction management; Bunk delivers a searing message to Omar; Daniels keeps up the front of marriage to Marla.
Avon readies his troops for a war against Marlo; the detail works toward the top rungs of the Barksdale organization; McNulty reassesses his pursuit of Stringer Bell.