S5, E1: New Messiah cop, Joseph Walker (Marc Warren), is haunted by a past of violence, passion and betrayal, which threatens his ability to hunt down a killer with a terrifying message for the world. But are Joseph and his new squad (Marsha Thomason and Daniel Ryan), just tracking a criminal or are they themselves part of The Plan? Their lives are complex, messy and connected by an illicit love affair that involves CPS lawyer, Sarah Templar (Nina Sosanya). Are they being judged by the killer? Or are they just judging each other?