Gregory L. Williams

McNulty and Prez turn up in the wrong alley, Cutty finds help, Bubbles is wired up, and Pearlman and Daniels confront a cell-phone company.

Avon readies his troops for a war against Marlo. Meanwhile, as the crew works towards the upper levels of the Barksdale organisation, McNulty has doubts about the path he's chosen for himself.

Marlo takes care of some unfinished business and strikes a deal with Avon Barksdale. Meanwhile, Mayor Carcetti's chief of staff blames Royce for the Campbell revelation.

As McNulty and the detail continue to stake out Marlo's crew, newly-elected Mayor Carcetti is finding he is stuck between keeping his promises on education and his promises on law and order.

The brass begin to panic when Mayor Carcetti's master plan for the police department is leaked to the press. Meanwhile, McNulty shares some knowledge with Gutierrez, and Marlo turns to Proposition Joe with an enviable problem.

With a bounty on his head, Omar calls in a favour from Bunk. The election finally over, Royce and Carcetti make their peace, and contemplate their respective futures, and at school, Prez tricks his students into learning maths.