Witness For the Prosecution: A brutal and bloodthirsty murder has stained the plush carpets of a handsome London townhouse. The victim is the glamorous and rich Emily French (Kim Cattrall, Sex and the City). All the evidence points to Leonard Vole (Billy Howle, Cider with Rosie), a young chancer to whom the heiress left her vast fortune and who ruthlessly took her life. At least, this is the story that Emily's dedicated housekeeper Janet McIntyre (Monica Dolan, Eye In the Sky, The Casual Vacancy) stands by in court. Leonard however, is adamant that his partner, the enigmatic chorus girl Romaine (Andrea Riseborough, Bloodline, Birdman), can prove his innocence. Tasked with representing Leonard is his solicitor John Mayhew (Toby Jones, Detectorists, The Secret Agent, Tinker Tailor Soldier Spy) and King's Counsel, Sir Charles Carter KC (David Haig, The Thick Of It, Mo).