The Peaky Blinders come under fire when Tommy finds danger on his doorstep and a friend is brutally attacked. Could there be a traitor in the Shelby family’s midst?

As the charismatic Mosley shows his hand, Tommy prepares to make a treacherous new alliance.

Tommy agrees to dangerous new partnerships when a golden opportunity presents itself, and a Shelby party promises fireworks.

As Tommy reveals his intentions for Mosley, someone close to the Shelbys is targeted.

News of Tommy's activities have reached Winston Churchill. At a family meeting, Tommy lays out his plans for Mosley, which will take place at a rally Sir Oswald is leading. Tommy is surprised by another strategy, coming from an unexpected corner. Meanwhile, Tommy has his own secrets to reveal.