As derby day arrives, Tommy is faced with impossible decisions as he plans to strike back at his enemies and take the family business to another level. Meanwhile, Major Campbell has one final card to play - one that he is certain will bring about Tommy's demise.

As Tommy prepares to commit the most audacious crime of his career, an unexpected blow is struck, putting him under unbearable pressure. As he faces his worst fears he needs help more than ever, but is increasingly uncertain about whom he can trust. In a nerve-shredding race against time, Tommy is forced to confront hard truths about himself and his family that could change the Peaky Blinders forever.

December 1925. When Tommy receives a mysterious letter on Christmas Eve, he realises that the Shelbys are in danger of annihilation.

It is the night of the big fight - Bonnie Gold versus Goliath. But as the bell rings and the crowd goes wild, dangers lurk in the shadows for Tommy Shelby and his family. When Changretta plays his final ace, he sets in motion a series of events that will change the Peaky Blinders forever.

As the clouds of the coming storm gather, Tommy Shelby faces the consequences of his experiences and his actions.

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.

As Thomas Shelby prepares to oust Billy Kimber, hidden secrets are revealed and the family have to face up to the problems that have divided them. Meanwhile, Campbell, obsessed with taking down the Peaky Blinders, unleashes one last plan to destroy them.

As the Shelbys come to terms with the shocking events of Christmas Day, Tommy endeavours to unite his family and a bold new enemy makes his move.

Thomas Shelby has to deal with an IRA chief who has come to Small Heath to avenge his cousin's death. Meanwhile Campbell gets closer to the stolen guns, and Grace has to decide whether her loyalties lie with him or with Thomas.

Tommy goes to London to meet the wildly eccentric and volatile Duke Leon and soon discovers the extreme lengths his new paymasters are willing to go to in their quest for power. In Birmingham a personal dispute with the Italians threatens to explode into a devastating war.

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

Tommy sets off to North America, where the end of Prohibition brings new opportunities. But he faces new danger from an old adversary who is finally making his move.

Arthur and Michael both end up arrested and imprisoned. As Tommy's base in London is obliterated. Major Campbell has Tommy and his family under his thumb. Polly compromises herself hoping to secure Michael's freedom, but their relationship may be beyond repair at this point. Someone from Tommy's past pays him a visit, opening old wounds and leaving him to make a impossible decision.

Tommy finds himself engaged in bloody battle with Luca Changretta and his gang. Lizzie has even greater news to break. Meanwhile, an army colonel has questions for Ada about her past as a communist, and Jessie Eden confirms just how far she is prepared to go in pursuit of her cause.

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?

Tommy takes his brothers on a hunting expedition and shares some important family news. He also outlines his intentions for the most daring criminal act the Peaky Blinders have ever undertaken.

Thomas Shelby's war with the Lee family of gypsies escalates, and Campbell puts further pressure on him to deliver the stolen guns. Meanwhile Thomas's brother John plans to marry a former prostitute, but Thomas suspects that she's still on the game.

Tommy hatches a plan to take control of the southern racecourses. He also meets the aristocratic May Carleton, and sees an opportunity to move up in the world. Meanwhile both Major Campbell and London gangster Darby Sabini plan Tommy's downfall.

Responding to the Italians’ actions, Tommy is set on a path of deadly vengeance that could take him to his darkest place yet, and threatens to splinter the family. As Arthur struggles with his conscience, Linda implores him to stop his illicit work with the Peaky Blinders.

Tradition weighs upon Arthur as Changretta finds a chink in the Shelby armour and Changretta continues to plan ways to continue the vendetta in the most devastating way possible.

The Peaky Blinders are lured by the Italians into a cat-and-mouse chase on the streets of Birmingham. As his factory lies idle, Tommy confronts the possibility that the Communists might win and he will be deemed a traitor to his class.

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

Business is booming for the Peaky Blinders, as Shelby starts expanding both his legal and illegal operations. He plans for the future, looking at managing a race track in the South. He soon comes across some new adversaries, testing him in very different ways. Back in Birmingham, Shelby's home town is challenged by members of his family reacting to the upturn in their fortunes. A enemy from his past also returns hoping to exact their plan of revenge of biblical proportions.

Arthur leads the Peaky Blinders takeover of London's Eden Club. Sabini decides to put old feuds to one side, convincing Alfie to one side to get rid of the Peaky Blinders. Tommy hires May Carleton to train his race horse, and the pair become fast friends. In Birmingham, Michael joins the family firm, hoping to help Tommy's businesses become more legitimate. Whilst Tommy's insecurities are intensified as he discovers what Major Campbell wants him to do.

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