A new recruit causes a stir at Ashfordly police station. PC Rob Walker was brought up in Aidensfield but his family life was far from perfect and his father dabbled on the wrong side of the law. Oscar Blaketon remembers Walker senior all too well and he still has some unfinished business with Rob. Meanwhile, Ben and Liz's fund-raising efforts appear to have rubbed off on Vernon, who begins to show his charitable side.