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; 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.