Marlo assumes control of the co-op telling the members that Omar was responsible for Proposition Joe's death. Bunk revisits some old leads but is frustrated in his attempts to get blood work from the crime lab.
With Rawls looking to make a premature murder arrest in three murders linked to D'Angelo and Barksdale, McNulty and Greggs turn to an unlikely ally to secure a delay in the case and preserve the significant wiretap gains being made: Daniels.
The Detail has a setback, and needs a new co-operator, while Russell and Bunk revisit Philly, looking for evidence. Brother Mouzone talks with Stringer Bell regarding their agreement, leaving Bell to contend with a dissatisfied Avon Barksdale.
A reticent Avon readies his troops for a seemingly endless war against Marlo. Meanwhile, as the detail works towards the top rungs of the Barksdale organisation, McNulty reassesses his pursuit of Stringer Bell and the path he's chosen for himself.