Guest Stars Anna Maxwell Martin as Kelly Major Amanda Payton as Dr. Alison Parfit Rosie Cavaliero as DCS Dennett Tracy-Ann Oberman as Helen Chalmers Emily Lloyd-Saini as DI Ryle Steve Oram as DI Gilbert Michelle Greenidge as PC Williams (not Judy) Anna Leong Brophy as The Voice of A.L. David Shelley as Priest Richard Pepple as Kristof Faith Edwards as Civil Servant Leila Hoffman as Mrs. Latimer