Filming has started on series four of the ITV1 detective drama Grace, starring John Simm as Detective Superintendent Roy Grace. The series is based on the novels by Peter James and is set in Brighton. Returning cast members include Richie Campbell, Zoë Tapper, Craig Parkinson, Laura Elphinstone, Brad Morrison, and Sam Hoare. The new series will also feature actor Robert Glenister. The series will consist of four feature length films based on Peter James's novels. The viewing figures for series three have been strong, with an average of over 5.6 million viewers per episode. Executive Producer Patrick Schweitzer expressed excitement about adapting more of Peter James's books for ITV. Peter James himself commented on the series.