A disgraced police detective goes undercover to break up orgainzed crime in the city where he lives and faces off against a powerful mobster.

Quinn finds a photograph that links crime boss Dugan with Captain Geary. Meanwhile, Murtha offers Rooney a union card.

Lonnie the snitch informs Quinn that his murdered partner, Tim, was nothing more than a corrupt cop involved in a ring that could go as high as the captain.

Quinn investigates the disappearance of a man known as Dogface and suspects that Jimmy is behind it. Danny finds a decent job and tries to be a good family man. Fivers pressures the Mayor to change the mind of a councilwoman he's close to.

Quinn can't arrest the prime suspect in the death of his partner when Leo recants a statement linking Jimmy Murtha to the murder weapon.

Quinn finds Murtha's freezer; the Easys mourn Mr. Kinnear. Meanwhile, Elli skips town and the mayor checks into rehab.