Four months after the shoot-out in West Virginia, Del has returned to the Pittsburgh P.D. while the folks in Buell try to get their lives back on track.

A new murder in Buell lights a fire in Steve as he doubles down on his suspicions of Grace and Del. Del continues to investigate the bombing in Pittsburgh while also becoming more enmeshed in the Brotherhood.

Cynthia becomes suspicious of everyone as she tries to figure out what happened to Vic. Angela and Del are surprised when they arrive at an urgent police call and things are not as they seem. Lee reconnects with Alejandro when she goes to New York to sign their divorce papers.

Fighting crippling pain, Del is determined to continue his investigation and turns to Steve for help. Billy leaves for basic training and finds comfort when he befriends a fellow traveler. The Landwill conflict comes to a head.