Guest Stars Rosie Cavaliero as DCS Dennett Amanda Payton as Dr. Alison Parfit Anna Maxwell Martin as Kelly Major Steve Oram as DI Gilbert Emily Lloyd-Saini as DI Ryle Michelle Greenidge as PC Williams (not Judy) Anna Leong Brophy as The Voice of A.L. Louise Stewart as SOCO Gemma Arrowsmith as Mrs. Barlow Michael Armstrong as Kelly's Patient
