We wrap up the season with Jesse Winchester's "Step By Step," catching up with the answer to McNulty's "What the fuck did I do?" as it applies to each major character. First, a rough-looking Bubbs -- reunited with Johnny -- get ready to jack some copper pipe from an unattended van, only to abandon the plan when a uniformed Santangelo comes around the corner at just the right moment, twirling his baton.

At a ceremony conferring his new rank, Carver salutes a grave Burrell.