Harris’ investigation continues. Isaac leaves town. Billy and Lee reunite as Buell celebrates a shotgun wedding.

Grace enlists help in her effort to unionize the dressmakers. The sheriff gets an anonymous tip about the murder in the steel mill.

Isaac befriends someone who teaches him the rules of the road. The sheriff searches for evidence in Billy and Grace’s trailer. Billy tells Lee what happened in the steel mill.

Harris races the clock in his search for the anonymous eyewitness. Lee seeks professional advice about whom to protect. Harris’ old Pittsburgh PD partner pays him a visit.

Alejandro learns of Lee’s history with Billy. Isaac turns his first trick solo. Harris travels back to Pittsburgh with his old partner to repay a debt.

Billy gets in with a questionable crowd. Isaac travels alone. Harris’ investigation into the anonymous eyewitness continues as a high school football player ODs.

Isaac is taken in by a kind stranger. Grace’s union drive is put to the test. Billy fires his public defender. Harris realizes what he has to do.

Harris finally finds the anonymous eyewitness. Lee decides not to return to New York. Billy is returned to the general prison population to face the consequences of his actions. The D.A. may be forced to drop the case. Season finale.