The fourth and final finds ex-con Lucas Hood (Antony Starr) returning to Banshee without his badge, but with a new mission: to hunt for a vicious serial killer and to track down a long-lost ally.

Season 4 begins two years after Lucas and Carrie (Ivana Milicevic) orchestrated a multimillion-dollar heist that went bad, leaving Carrie's husband dead and Job (Hoon Lee) in the hands of a criminal gang. After a bender, during which he finds an unlikely saviour in Rebecca (Lili Simmons), Lucas emerges from a self-imposed exile and goes back to Banshee to find it a drastically changed town that's facing multiple threats on many levels.