Filming is underway on series four of critically acclaimed ITV1 detective drama, Grace, starring John Simm as Detective Superintendent Roy Grace and based on the best selling novels from globally renowned author, Peter James.　　Set in Brighton, Grace also sees returning cast members Richie Campbell (Top Boy, Stephen) as DS Glenn Branson, Zo? Tapper (Liar) as Cleo Morey, Craig Par..6080