A homicide detective is assigned to investigate a street gang after disagreeing with a judge.

A witness in D'Angelo's trial is found murdered; officers head for the gang's home turf.

Interviews by officers lead to a minor riot; D'Angelo's crew gets raided.

Gang members arrested in the raid face arraignment.

McNulty's detail tries breaking the code on the gang's pagers.

Wallace and D'Angelo wrestle with their consciences.