At Derby Day, Tommy sets his plans in motion, though not without casualties. Polly winds up confronting Major Campbell with brutal results.
Arthur gets a bad surprise when he visits Alfie Solomons. And when Michael lands in jail, something worse happens to his mother.
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 manages to keep himself alive. He gets back to London to speak with Alfie Solomons, and later writes a letter to Winston Churchill himself.
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.