Court is in session for Sienna Miller and Dominic West in HBO's upcoming legal drama War. Created by George Kay (Lupin, Hijack), the thriller follows London's most elite law firms as they battle for victory at any cost. Season one follows the explosive divorce of British tech entrepreneur Morgan Henderson (West) and international film star Carla Duval (Miller). "This is likely to be the biggest divorce trial in British legal history," a lawyer tells West's character in the trailer. THE CASTWest plays Morgan Henderson, Miller stars as Carla Duval with Phoebe Fox as Serena Byrne and James McArdle as Nicholas Taylor.