At Derby Day, Tommy sets his plans in motion, though not without casualties. Polly winds up confronting Major Campbell with brutal results.
Tommy gets to know May Carleton a bit better. Meanwhile, things with Campbell and the IRA get very complicated and dangerous for Mr. Shelby.
Polly's long lost son Michael becomes a part of the family. Maybe a bit too much for her liking.
Tommy stirs up trouble in London and may just pay with his life for it.
The day's come for Tommy and the Blinders to oust Billy Kimber. But Grace, Campbell, even Ada, they put a wrench in those plans.
Grace and Tommy get closer than they should, as Inspector Campbell gets jealous. Meanwhile, Arthur Sr turns up again causing a bigger rift between the brothers.
When Freddie won't leave town, Tommy's got to figure out a way to settle things down. For himself, for Ada, and for the sake of their business.
Campbell meets with Tommy after a big ruckus and a phone call from Winston Churchill.