War Trailer: Dominic West and Sienna Miller Face Off in a Scandalous London Divorce Thriller

Love, betrayal, money and the law are about to collide in spectacular fashion. HBO Max and Sky TV have unveiled the full trailer for their upcoming legal drama thriller War, a sleek and scandal-filled series set inside the ruthless world of London’s most powerful law firms. Starring Dominic West and Sienna Miller at the centre of a bitter divorce battle, the series promises a story where personal secrets can become courtroom ammunition and winning can come at a very high price.

The series stars Dominic West as tech titan Morgan Henderson, whose seemingly powerful life begins to unravel when his marriage to international film star Carla Duval, played by Sienna Miller, heads towards a highly publicised and contentious divorce. What begins as a deeply personal split quickly turns into a legal spectacle, sending shockwaves through boardrooms, bedrooms and courtrooms while drawing some of London's most formidable legal minds into the fight.

At the centre of the legal battle are two prestigious rival firms, Cathcarts & Sons and Taylor & Byrne. Both firms operate at the highest levels of London's legal world, where reputations are everything and every case can become a battle for power. The Henderson-Duval divorce becomes the perfect battleground, pulling ambitious young lawyer Jonathan “Johnny” Warren, played by Archie Renaux, into an environment where loyalty can be tested and professional ambition can come with its own dangerous consequences.

The trailer sets the tone with the ominous line, “You are the wronged party here,” immediately suggesting that there will be plenty of competing versions of the truth. The series appears to explore what happens when a relationship breaks down in public and both sides have access to powerful lawyers determined to control the narrative. In this world, allegations, secrets and strategy can be just as important as what actually happened behind closed doors.

Adding to the appeal is the impressive ensemble cast. Alongside West, Miller and Renaux, Marisa Tomei, Kelly Macdonald, David Harewood, Richard Schiff, Pip Torrens, Miles Jupp, Honor Swinton Byrne and Phoebe Fox are part of the series. With such a diverse collection of performers, War has the opportunity to move beyond its central divorce and explore the professional and personal lives of the lawyers caught in the crossfire.

The series comes from acclaimed British writer George Kay, the creator associated with hit international shows such as Lupin and Hijack. Kay has developed War with a writing team that includes Jess Brittain, Kelly Jones, Emilie Robson, Krissie Ducker, Yemi Oyefuwa, Catherine Shepherd and George Kay. The episodes are directed by China Moo-Young, Ben Taylor and Jennifer Sheridan, bringing together an experienced creative team for the legal thriller.

Interestingly, War has already been planned beyond its first storyline. While the opening series centres on the explosive divorce between Morgan and Carla, Season 2 is already filming and will shift the focus to another major legal battle — an explosive defamation case following the conclusion of the divorce. The rival firms will once again find themselves on opposite sides, suggesting that the professional war between Cathcarts and Taylor & Byrne is far from over.

That continuation also gives the series a larger framework than a single courtroom drama. The first season establishes the rivalry between the firms through a high-profile divorce, while the second season takes the same legal world into the territory of defamation and reputational warfare. It means that even when the marriage at the centre of the first case reaches its legal conclusion, the battles between the lawyers are only beginning.

With its combination of high-profile clients, elite London law firms, complicated relationships and courtroom strategy, War looks set to bring a glossy but dangerous edge to the legal-thriller genre. The trailer promises a world where every conversation can become evidence, every betrayal can become leverage and every courtroom victory can have consequences outside the courtroom.

War premieres on October 1, 2026, with Dominic West and Sienna Miller leading a cast caught in one of London's most explosive divorces. And as the trailer makes clear, when love ends and lawyers enter the room, the real war is only beginning.