HBO and Sky released the first trailer for War on Thursday, revealing Sienna Miller and Dominic West as a divorcing couple whose split ignites a brutal courtroom war between rival London law firms ahead of the show's October debut.
TL;DR
- War, an eight-episode legal drama, premieres October 1 on HBO and October 2 on Sky and NOW in the UK.
- Dominic West and Sienna Miller play a divorcing tech entrepreneur and film star locked in a high-profile split.
- Archie Renaux stars as a young lawyer drawn into the case between rival firms Cathcarts & Sons and Taylor & Byrne.
- Creator George Kay, known for Lupin and Hijack, has already secured a second season.
A courtroom clash built on a celebrity divorce
The trailer follows British tech entrepreneur Morgan Henderson, played by Dominic West, and international film star Carla Duval, played by Sienna Miller, as their marriage collapses into a headline-making divorce. Their split pulls in two of London's most powerful law firms, Cathcarts & Sons and Taylor & Byrne, which face off on their clients' behalf, according to the official synopsis reported by Variety.
A young lawyer caught in the crossfire
Ambitious lawyer Jonathan "Johnny" Warren, played by Archie Renaux, is drawn into the case as ambition and betrayal collide inside the two firms. Phoebe Fox and James McArdle also star as Serena Byrne and Nicholas Taylor, law partners at Taylor & Byrne, according to Deadline.
From Lupin to London's law courts
Series creator George Kay, previously behind Lupin and Hijack, writes and executive-produces the eight-part first season. HBO and Sky have already greenlit a second season, which will centre on a defamation case, according to Deadline.
When and where to watch War in the UK
War premieres in the UK on October 2 on Sky and streaming service NOW, one day after its US debut on HBO and HBO Max. New episodes roll out weekly on Thursdays.
| War at a glance | |
| Episodes | Eight |
| UK premiere | October 2, on Sky and NOW |
| US premiere | October 1, on HBO and HBO Max |
| Creator | George Kay |
Source: Sky/HBO press materials
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Reported from publicly available interviews and verified press sources. Last reviewed September 17, 2026.
