Maria Broom

When a witness who testified against D'Angelo Barksdale is discovered murdered, McNulty and the detail take the opportunity to link the killing to Avon Barksdale's drugs crew.

The squad busts Barksdale's crew but Stringer smells a rat and orders changes that could put the surveillance back to square one.

As the war between Omar and the Barksdale crew escalates and casualties pile up, the detail is forced to look for a new informant.

As the unit mounts a large-scale round-up of Barksdale gang members, Avon and Stringer plot to stop their world falling apart.

McNulty's curiosity leaves the department with more murders to probe, but the sinister perpetrator seems one step ahead.

The explosive third season begins. The Barksdale gang faces challenges at every turn in Baltimore's changing landscape.