The fourth series of what many consider to be the finest drama on television. Things have changed since the end of the last series: Jimmy McNulty (Dominic West) is now a contented street cop and family man, while in a politically motivated shake-up, Major Crimes detectives Freamon (Clarke Peters) and Greggs (Sonja Sohn) have been shifted to Homicide. Having left the force after accidentally killing another cop in Series Three, Roland Pryzbylewski (Jim True-Frost) is the new eighth grade teacher at the beleaguered Edward Tilghman Middle School. With the fall of Avon Barksdale and his crew, and the ascent of young Marlo Stanfield (Jamie Hector) as West Baltimore's drug king, the detail continues to 'follow the money' up the political ladder in the midst of a mayoral election that pits the black incumbent, Clarence Royce (Glynn Turman), against the ambitious white councilman, Tommy Carcetti (Aidan Gillen). The theme of urban education is explored through four new characters - Michael Lee (Tristan Wilds), Namond Brice (Julito McCullum), Randy Wagstaff (Maestro Harrell) and 'Dukie' Weems (Jermaine Crawford) - as they traverse adolescence in the stunted, drug-saturated streets. Episodes comprise: 'Boys of Summer', 'Soft Eyes', 'Home Rooms', 'Refugees', 'Alliances', 'Margin of Error', 'Unto Others', 'Corner Boys', 'Know Your Place', 'Misgivings', 'A New Day', 'That's Got His Own' and 'Final Grades'.