Guest Stars Anna Maxwell Martin as Kelly Major Amanda Payton as Dr. Alison Parfit Rosie Cavaliero as DCS Dennett Richard Gadd as Liam Cleasby Steve Oram as DI Gilbert Emily Lloyd-Saini as DI Ryle Michelle Greenidge as PC Williams (not Judy) Anna Leong Brophy voices The Voice of A.L. Richard Pepple as Kristof Montel Douglas as Cleasby's Supplier