Guest Stars Anna Maxwell Martin as Kelly Major Rosie Cavaliero as DCS Dennett Amanda Payton as Dr. Alison Parfit Tracy-Ann Oberman as Helen Chalmers Richard Gadd as Liam Cleasby Steve Oram as DI Gilbert Emily Lloyd-Saini as DI Ryle Michelle Greenidge as PC Williams (not Judy) Michael Quartey as SIU Officer
