The film reveals several major twists and definitive conclusions to the Shelby saga:
- The Fate of Arthur Shelby: Arthur does not appear alive in 1940. A devastating flashback reveals he died in December 1938 when Tommy, during an alcohol-fueled fit of madness and despair, strangled his brother during a violent dispute. This haunting sin triggered Tommy's self-imposed exile and death wish.
- The Assassination of Ada Thorne: When Ada confronts John Beckett and uncovers the full scale of the Nazi currency conspiracy, Beckett has her ruthlessly assassinated. Her murder devastates the family and catalyzes Duke's decisive turn against the fascists.
- The Liverpool Dock Showdown: Hayden Stagg and the Peaky Blinders storm the Nazi warehouse from canal narrowboats while Tommy navigates disused underground tunnels. The counterfeit currency is incinerated, thwarting the economic invasion, and Tommy shoots Beckett dead.
- Tommy's Final Sacrifice & Pyre: Mortally wounded during the shootout, Tommy refuses medical aid. Handing Duke the bullet inscribed with his own name, Tommy asks his son to finish him off on his own terms. Duke honors the request, Tommy's body is burned on a traditional Romani funeral wagon, and Kaulo recovers his finished manuscript, leaving Duke to take the mantle as leader of the Peaky Blinders.