David Simon's masterful social commentary went back to school, quite literally, in the fourth season, which focuses on Baltimore's crumbling education system. A relevant link to its first three seasons is supplied by Roland "Prez" Pryzbylewski (Jim True-Frost), who left the police department to become a teacher at Edward Tilghman Middle School, a hardscrabble institution on life support that services a low-income, drug-infested neighborhood. (Incidentally, Prez's career path is similar to one of the series' producers, Ed Burns). His eighth-grade math class includes a close-knit quartet of friends -- Randy Wagstaff (Maestro Harrell), Michael Lee (Tristan Wilds), Duquan "Dukie" Weems (Jermaine Crawford) and Namond Brice (Julito McCullum). The wisecracking Brice is ignominiously selected to be part of a university experiment studying at-risk kids, which counts a former police commander, Bunny Colvin (Robert Wisdom), as a consultant. Out on the corners, Marlo Stanfield (Jamie Hector) strengthens his grip on the city's West Side narcotics trade once dominated by the Barksdale gang, and with his cold-blooded lieutenants, Chris (Gbenga Akinnagbe) and Snoop (Felicia Pearson), devises an ingenious method to hide the collateral damage of his ascent from the law. This sleight-of-hand bedevils detectives Freamon (Clarke Peters), Greggs (Sonja Sohn) and Bunk (Wendell Pierce). The trio are flummoxed by the lack of victims that would surely coincide with Marlo's ever-widening domain, a savage power grab that also threatens the relative peace of the New Day Co-Op under East Side pooh-bah Proposition Joe (Robert F. Chew). Meanwhile, the Democratic primary in the city's mayoral campaign pits the entrenched African-American incumbent, Clarence Royce (Glynn Turman), against Councilman Tommy Carcetti (Aidan Gillen), a scrappy politico with a savvy campaign manager in Norman Wilson (Reg E. Cathey), but a long shot to become Charm City's first white chief executive in years.

The fourth season kicks off with Annie (Piper Perabo) and Auggie (Christopher Gorham) adjusting to their new romance and how it changes their working relationship. Annie also navigates an uneasy partnership with Henry Wilcox (Gregory Itzin), who gives her shocking information about Arthur (Peter Gallagher). Joan (Kari Matchett), forced to endure the fallout from the scandal involving Arthur, receives surprising news that complicates things further. Hill Harper joins the cast as Colombian station chief Calder Michaels.

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