1920s London. A murder, brutal and bloodthirsty, has stained the plush carpets of a handsome London townhouse. The victim is the glamorous and rich Emily French (Kim Cattrall). All the evidence points to Leonard Vole (Billy Howle), 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 Mackenzie (Monica Dolan) stands by in court. Leonard however, is adamant that his partner, the enigmatic chorus girl Romaine (Andrea Riseborough), can prove his innocence. Tasked with representing Leonard is his solicitor John Mayhew (Toby Jones) and King's Counsel, Sir Charles Carter KC (David Haig).
