Holding synopsis:When Tommy Shelby (Cillian Murphy, Dunkirk) receives a mysterious letter on Christmas Eve, he realises that his entire family is in danger of annihilation. As the enemy closes in, Tommy flees his country house and heads to the only safe place he knowsCo-starring Helen McCrory (Skyfall), Paul Anderson (The Revenant), Aidan Gillen (Game of Thrones), Adrien Brody (The Grand Budapest Hotel) and Tom Hardy (Mad Max: Fury Road), Steven Knights beloved crime saga makes a triumphant return to the streets of Birmingham in its most sensational and action-packed chapter yet.