After Kay tails Celia Herrington's mystery visitor to a Ministry of Defence building, Dom is convinced that Kirsty will no longer be able to ignore their pleas for help. But first, they must hide Clinton's dossier somewhere safer - after an attempted raid on Dom's parents' house.

Posing as volunteers, Dom and Kay visit Riverford Residential Home, suspecting it could be a front for the Brightmarsh Gang.

Dom and Kay track down a new, potential undercover contact called Kirsty. Can she get them out of the Brightmarsh Gang?

Dom and Kay fail to meet the Brightmarsh Gang's deadline for a drugs payment. Can Dom persuade Kay to steal from the church, or will Kay's faith mean they get their legs broken?

Dom and Kay have a body to bury. They're in a mess, frightened and completely on their own. Who else knows about their mission, other than Clinton? Then, they bump into fellow PCSO Pricey in a 24-hour café, who doesn't quite believe Dom and Kay's story as to why they are caked in mud.

Dom and Kay, two ordinary PCSOs, are recruited by Detective Inspector Clinton Blair to go undercover and infiltrate the infamous Brightmarsh Gang.