McNulty and Prez turn up in the wrong alley, Cutty finds help, Bubbles is wired up, and Pearlman and Daniels confront a cell-phone company.
Brother Mouzone returns to Baltimore on a mission of revenge and casts a wide net in his search for Omar, who has his own plan for vengeance. Colvin manages, for now, to put off a newspaper reporter inquiring about Amsterdam.
Avon readies his troops for a war against Marlo. Meanwhile, as the crew works towards the upper levels of the Barksdale organisation, McNulty has doubts about the path he's chosen for himself.