Two people matched by a dating app begin to wonder why the System is how it is, but that has repercussions.
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.
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.
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.
Tommy and the family rejoice at getting a legitimate betting license. Meanwhile, he also figures out Grace isn't who she claims.
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.