In a small rust-belt town in southwest Pennsylvania, Chief of Police Del Harris investigates after a dead body turns up in an abandoned steel mill.

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.